IIRC, CORGI doesn't exist anymore, the new certification is 'GasSafe'.
http://www.gassaferegister.co.uk/
If they aren't listed, a call to Trading Standards is your next step, after making it safe.
http://www.gassaferegister.co.uk/
If they aren't listed, a call to Trading Standards is your next step, after making it safe.