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Quite expensive the wheel clamps. Anyway none would fit my 10" wheels.

I opted for a hitch lock instead for about £15ish

Depends on the size of your trailer wheels.

Our trailer has 13" wheels and the sas clamp turned out to be the best after trying several types, as it covered the wheel nut and tightened up properly. trailer wheels are narrower than most modern car wheels. 

One bit of advice, I discovered is that cheap wheel clamps don't fit well

You can get clamps for smaller trailer wheels. try ebay. but in my opinion if you think theft is a risk then get the best clamp your budget will go to.

Check Towsure - they sell various wheelclamps suitable for wheels 10" up to 17"

See here:
http://www.ukcampsite.co.uk/redirect.asp?redir=http://www.towsure.com/search/wheelclamp

We have a Milenco wheel clamp which is great but very heavy.