Kitchen worktop offcut (Fishponds BS16)

I need a piece of kitchen worktop (or similar) 30 inches wide, x approximately 26 inches deep, to make a solid plinth across some wobbly floorboards.
Ideally honeyish / wood coloured ("oak" or "beech"? ) - but I guess it could be black. And in my dreams it WOULD be real wood, though I guess this is unlikely. I am happy to collect it.