So, I'm now allowed to mention this (the ASA gave me strict instruction to keep it confidential until Gemporia and the Press were informed).
I referred two complaints to the Advertising Standards Authority - both of which have been upheld.
Hopefully it will change some of the antics on Gemporia - but I suspect not (particularly as I've reported them in the past for their claims of "we're giving this away" - which they still say on occasions despite the ASA ordering them not to say it).
ASA Ruling - Upheld
I also reported them to Trading Standards for taking so long to refund customers. Trading Standards confirmed that refunds must be issued within 14 days. Although Trading Standards did not confirm to me whether they had taken action against Gemporia, I've noticed that my past few returns have been refunded - on the 14th day precisely - so I suspect they've had a warning there too.