Yes, the larvae of all these types of beetles can be quite indistinguishable. Most pest control companies in the UK offer free quotes, so they could come and look at the infestation and give you their opinion.
If they are woodworms though, acting as quick as possible is highly advised. If they were, though, you should be able to find and recognize holes in your property's wood which should look like this
http://static.safeguardeurope.com/images/woodworm_damage_246.jpg You could try to tackle the infestation alone, but in my experience beetles are nasty buggers, spread fast and are hard to locate (as in, their nesting grounds).
Cheers,
Phil - a professional
pest expert in UK