OK, I’ll try to be sensible.
As I’ve said many, many times before on AB (because, strangely, this issue often arises) your question is not worth asking and any answers you receive, sensible or otherwise, are not worth reading. And here’s why:
Even if every member of the electorate, all the MPs, all the Ministers and all members of the House of Lords wished it, capital punishment could not be reintroduced in the UK. This is because it is contrary to the European Convention on Human Rights (ECHR) and our own Human Rights Act (HRA) of 1998.
We could repeal the HRA. Prior to the General Election the Conservatives suggested they might do so and replace it with a “Bill of Rights”, but have subsequently decided, since forming a Coalition government, that they have more pressing matters to deal with. However, this would have little effect because we would still be bound by the ECHR.
We could withdraw from the ECHR. However, being a signatory is a prerequisite to being a member of the Council of Europe and such membership is, in turn, a condition of EU membership.
We could withdraw from the EU but the likelihood of that is slim to say the least.
It is most unlikely that there is any widespread support in the UK for the reintroduction of the death penalty anyway, but this is just one example demonstrating why the UK is no longer in charge of its own affairs and will never be so whilst its membership of the EU is maintained. In short, this issue, among many, many others, is not up for debate here in the UK.
How does that grab you for sensible?