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Relative strength and ambition of cabinet colleagues.
PM cannot afford to ignore senior and influential party members. Need to keep ideological balance to prevent a bias. Ambitions of the cabinet members need to be taken into account to maintain th

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A limit of the PM is the need to maintain party unity. All political parties are driven by the will to get elected, and therefore thr maintenance of unity gives the appearance of an effective party, and allows a party to be more effective in policy and decision-making with less gridlock. Therefore the Prime Minister must prioritise party unity and would be limited in making decisions that may split the party. E.g. David Cameron could not enforce a pro-Brexit party line due to the risk of dividing the Conservative Party, and in turn was limited in his ability to impose a party view due to the need to maintain party unity.

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A constraint on the Prime Minister could be their handling of international crises. The Prime Minister is unable to declare war as this can only be done by Parliament, therefore limiting their power and influence regarding such situations, as the prime minister cannot exact their own views or opinions but can only contribute them. An example of this would be the 2013

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One constraint to the PM's power is the strength of support within their party. If the PM's policies do not reflect the views of the party as a whole, including the backbenchers, then it will become difficult for the PM and cabinet to pass legislaton as a majority is needed in the House of Commons. This means that the PM and cabinet would not be able to carry out their functions of creating effective legislation to be passed. In extreme circumstances, MPs can pass a vote of no confidence when their is little support for the PM such as in 1979 when MPs staged a vote against the administration of Labour PM James Callaghan.

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A constraint on the power of the PM is the strength of support within the party. This constraint comes about within the party. This constraint comes from how competent the leader appears from within the party; for the Conservatives it's whether or not the party feels the leader will win the next general election. The limit on PM power is if the PM lacks support within the party, cohesion will be lacked, so it will be hard for the PM to implement things, for example, at a parliamentary vote, the MPs won't all be likely to vote as one (e.g. Tory voting as one in Brexit vote 2017). If the PM lacks strength from within the party, they risk being ousted (Thatcher in 1990).

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One constraint to the prime minister is media and public opinion which can influence their credibility. This is done through tabloids and other media outlets. For example the 'David Hameron' 🐖 Incident in which it was reported the pm performed sexual actions to a pigs head during university. This undermined legitimacy and made him the laughing stock of PMQ's where he received heavy scrutiny 🐷🐷🐷🐷

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One constraint on the Prime Minister's power is the strength of support they enjoy within their party. This is because of their party is not behind them they can remove them as party leader and thus replace them as Prime Minister. This constrains them as they are forced to consider the opinions of others before acting. An example of a Prime Minister who no longer enjoyed the support of their party faithful is Margaret Thatcher. Michael Hesetine, a former cabinet minister Thatcher alienated during the 1986 Westland Affair, triggered a leadership contest in late 1990 which ousted her as PM. She had alienated her party with the wildly unpopular community charge (or 'poll tax' which saw protests even in true blue Surrey, and her party no longer had faith that she could lead them to victory in the next general election. Her party had also issued her a warning the previous year when a Anthony Meyer, a backbench Tory MP, stood against her in a leadership contest as well as the loss of her Chancellor and Foreign Minister, the latter of whom gave a scathing attack on the PM during his resignation speech in Parliament. This shows how crucial party support is for a PM to maintain their position, and how important it is that they listen to their party

A second constraint would be the strength of support within the governing party,asit  was inevitably this which led to the resignation of Margaret thatcher. This links in largely with the relative strength of cabinet colleagues, but the former is more significant as it wouldn't matter about strength if

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A limitation on the powers of the PM is the need to maintain unity, cohesion and loyalty within the Cabinet. If this is not ensured, popular ministers may leave the Cabinet, exposing the flaws in the Prime Minister's ability to lead policy making. This may cause a further divide amongst MPs through a "ripple effect", an example of this being when Howe and Lawson left Thatcher's Cabinet, damaging her reputation within the Conservative Party.

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A large constraint on Prime Ministerial power is the credibility of the opposition party. This credibility can become evident from the perceived competence of the opposition party leader or the cohesiveness of the opposition MPs and the shadow cabinet. This can become a limit on PM power as a strong opposition can considerably lessen the government, and by extension the PM's ability to pass legislature in the House of Commons. The credibility of the Labour Party at present is questionable, due to the perceived ineptitude of Jeremy Corbyn, Labour Leader, and the division among the party. For this reason, the Conservative party hasn't not met strong resistance since May's ascent to power and Prime Minister May was only stopped from triggering article 50 without a commons vote by a recent Supreme Court ruling.

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A large constraint on the limit on priministerial power is the strength and credibility of the opposition party. The credibility of the opposition directly affects how powerful/influential the prime minister is. The more credible the opposition, the more limits there are on the PM's power in the HoC. Currently, the PM would have significantly less limits on their power due to the current state of the Labour party, which currently has numerous factions. Theresa May would have fewer limits on her power as she can influence a much larger proportion of the house because of the many splits in the house and little confidence of the main opposition party's leader, Jeremy Corbyn.