I wouldn't call myself a cryptoite, but I intend on taking a small (beginning) stake. Hard to tell who is not trustworthy until people, or you, are already screwed. I'm not a client yet but will probably use Kraken www.kraken.com if only because the trustee for the MtGox scandal trusted them to deal with it.
Don't know yet if I can become a client, you might find out before me (been kinda busy). You however (if I understand correctly you have British citizenship) might want to consider a broker in Germany. Germany because they have passed a law such that any crypto held for more than a year is not taxable like capital gains on a security, and because GB and Germany are EU.
Hope this thread grows legs!
If you're going to be dumb, you better be tough...