Think about it from their point of view. A decent constituency MP understands that every single vote may be the one that wins them the election and somebody like Paddy is worth two votes, in that they are one less vote for the opposition and one more vote for them. Most MPs get to interact with an incredibly small percentage of their voters and their best opportunity is a cold call door knock which isn’t ideal. You, however, want 5 minutes of their time and that might be all it takes to make you more likely to vote for them next time round. They should accept your request for 5 minutes and give you 10.
If they refuse unreasonably, they aren’t worth voting for in my opinion.
At a time when national political parties are so unpalatable, it is even more important to have a good constituency focussed MP.