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mespilus-
Does Pythagoras offer a greater dimension?
Just under 100cm (70^2 = 4900, so you're looking at sqrt(9800) which is just under 100).
Plus you've got to take into account the depth of the table top which will reduce the width that you can get through it as you can't go exactly from corner to corner.
Even then there might not be enough space to get the table top through vertically without twisting it, which will require even more leeway.
A ~10cm inverse shim on the inside of the loft hatch should be enough though.
Greenbank
Loft hatch is 70cm wide
Want to stick a 100cm x 160cm table up there.
Presumably 2 x 50cm x 160cm planks and then jointed underneath by a batten or something? They'll be going on some kee klamp stuff I'm getting cut. Doesn't matter what the surface is - just needs to be solid and provide a reasonably flat surface once it's assembled.
Where's my best bet to get cut to size? Every timber merchant I search for locally is shut at the moment and can't find a kitchen worktop type place that doesn't charge a fortune to chop up a 3m stretch of laminate.