2020-May-7 General Election
Most people give up on politics, if they are in a safe seat. Don't surrender. You can make a difference. Here is how:
Decide the prospective parliamentary candidates (PPCs)
This is the simplest, as so far, the PPCs for your constituency are not filtered by the party HQ. Join your local Labour party and become active. (This is a deciding factor in who wins support as a the PPC.) You don't need to propagate Labour literature, just develop your understanding of the local human network, and who the most likely PPCs are for your area. If you have one that is unsympathetic to your beliefs, find out the best candidate to oust them, and work to support that person.
To some extent, Conservative party HQ has a shortlist of candidates they want to run. Sometimes one of these PPCs is forced upon a constituency even against its wishes. Find out which of the PPCs best supports your cause, and do what you can to support them.
In both cases, the most important thing you could do is to use your inside knowledge of which of they vying candidates is the most likely to represent your own views. Then, work on establishing a network of people to join the local party with a view of choosing the most acceptable PPC.
Even if you are unable to change which party gains an MP, what you can do is steer politics at the local level towards your viewpoint. By being involved at an early stage, you will be able to field serious questions that the vying PPCs must answer, if they are to become the party's representative.
If all else fails, there is always a possibility that the PPC or even MP could be de-selected by the local party.
Remember, your efforts can help at the Council level as well as at Westminster.