An interesting read that was. I think it's already been pointed out btw, but here it is again:

FSA Register - Click and Buy No Longer Registered

They are, however authorized with an E-Money account. Which does not afford you protection under the FSCS:

Quote Originally Posted by FSCS.org.uk
The Financial Services Compensation Scheme is the compensation fund of last resort for customers of authorised financial services firms. If a firm becomes insolvent or ceases trading we may be able to pay compensation to its customers.

E-Money Services are not covered by the Financial Services Compensation Scheme