Fwiw my voting strategy would be: Labour across the board where they are competitive (even for loathsome MPs), Lib Dems in the Lib-Con marginals, whichever of Lib and Lab is more likely to defeat separatists in Wales and Scotland and non-sectarian candidates in NI.
If you don't mind me asking, what seat do you live in and what are its dynamics?
I live in Sheffield Hallam, which is basically a) a swathe of desolate moorland punctuated by well-heeled villages b) the affluent western suburbs of Sheffield and c) student housing from the University of Sheffield. This was a Labour target in 2015, but not because it's natural territory for the party (on paper, it is probably one of the worst Labour target in the whole of North England); but because of popular loathing for the incumbent MP - a guy you may have heard of:
He was saved by tactical voting by Tories (who used to be safe in this seat back in the day), and is presumably safe now that everybody has forgotten about the coalition and is angry about Brexit.
the local party will probably forget about him, and try and save our local incumbents. Penistone is probably the most vulnerable; but the Greens are apparently trying to oust us in Central (former leader Natalie Bennett is standing there).