M0nica
The law in this country sees MPs and councillors as people who are elected to Parliament/Councils on their own merits. They may well be members of specific political parties and people may vote for them because they support a particular party, but they are voted for on a personal basis.
You are the honourable member of Parliament for the constituency of Barchester. Not the Honourable Conservative member for the constituency of Barchester.
To change that would mean changing part of our constitution.
Nevertheless a large section of voters vote for a party not the candidate personally, the leader of that party has a big influence on voters.
Even at local level there are few independants and those that are have usually previously been party councilors and built a personal following, we had one, first Tory then LD, finally independant.


