I assume that you apply this universally and not just in the US. In Great Britain, I just don’t know who one could vote for in this case.
Abortion is simply not really on the agenda for most people here, nor for most politicians. Certainly there is no meaningful support for completely outlawing abortion. At most there is occasionally mention of moves towards every so slightly restricting access to abortion. Similarly, there is talk of the UK Parliament taking tentative steps towards legalising abortion in Northern Ireland, which is currently possible due to the Northern Ireland Assembly being temporarily, though seemingly indefinitely, suspended from operation.
It’s further complicated by the fact that abortion is one of the issues on which members of both houses of Parliament are typically guaranteed a free vote by their parties. While a party may have an official policy on abortion, its members will never be whipped to vote to support that policy. It’s therefore very difficult to know a candidate’s position on abortion unless he or she is particularly outspoken one way or the other. I can’t find a current list of members of the All-Party Parliamentary Pro-Life Group, but out of around 1,450 MPs and peers the number who are avowedly pro-life is probably barely in double figures (I assume that the bishops are pro-life, but I wouldn’t want to state that with absolute certainty). Prime minsters with strongly held Christian beliefs (Edward Heath, Margaret Thatcher, Tony Blair, and Theresa May) have made no attempt to push a pro-life agenda.
In short, I have always voted for pro-abortion parties. This is partly because it is almost impossible to vote for a party that is not pro-abortion, partly because abortion is virtually absent from the political agenda in any meaningful way, and partly because I choose which party or individual to vote for based on the totality of their views, not just on one issue.
We are currently led by a government that is quite possibly the worst in our entire history: the first government ever to be held to be in contempt of Parliament and the government that has suffered the largest defeat in a parliamentary vote in the whole history of Parliament. Our prime minister called an entirely unnecessary early general election and managed to lose her majority, remaining in power through a highly distasteful arrangement with a Northern Irish party. Meanwhile, our official opposition offers no viable alternative. Its leader enjoys scant support within his own parliamentary party but retains the overwhelming support of his party membership due to far-left entryism on a huge scale. He presents no convincing or coherent political programme, but promotes long discredited ideologies and gives succour to tyrants and terrorists.
I am therefore left with the choice of voting for the Liberal Democrats, a pro-European centrist party with strong and intelligent leadership, or for another party such as the strongly pro-life British National Party. Personally, I would never vote for the BNP on account of their being essentially Nazis.