Yes, it's superglue!
I'd go with M4 if you can: they're easier to tap. I've also been tipped that using more than 4 bolts is preferable, for a level, uniform seal, but I haven't verified it. I'm going for an 8 bolt pattern for my block.
Check for Lexan. McMaster I believe does ship to the UK, but you have to contact them. 1/4" is the thickness of the sample, and it's fine, but if I can, I'll stack a couple of them for a 1/2" thick top plate.
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