Woodworm key as such - no, not that I know of.
However, there are a few candidates here:
larva is that of a moth- maybe one of the house moths or clothes moths (moths not really my thing, but that is not a beetle - which woodworm are-)
Beetle is Aphthona euphorbiae, a very common flea beetle (leaf feeding beetle) which must have flown into the house
Thank you the flea beetle makes sense, but I'm not sure about the larvae being that of a moth as I found it inside a floor board (I split one trying to lift it and found it in there!) That wouldn't be a moth larvae would it?
Thanks again for your help.
if it was rotten enough to split could be anything, no need for it to be a 'professional' wood feeder; how big was it?
There are wood feeding micro-moths as well as general detritus feeders.
It was 1cm when it was at it's longest stretching itself while moving. The wood has lots of woodworm holes running through it which has reduced it's strength, but it's not rotten and wasn't split before I waded in :-)