FYI, a guide to FSA regulated brokers:
Compare FSA (UK) Regulated Forex Trading Sites & Brokers | UK
And brokers with segregated accounts:
Top 5 Regulated Forex Brokers with Segregated Accounts | UK
If your broker goes bust, your broker may owe you money if your account was in profit. This means that you are a creditor and your claim will rank alongside other creditor's claims. Your rank will depend on the insolvency laws in the country where your broker is incorporated.
Some countries...