It sounds fair to me, and my hourly rate is about double, and I bill seven hours a day, five days a week. The fact is that banks are all pretty rubbish at the moment and you have done well to A) remain patient and actually open the account (which is after all one of the best in the market at the moment), and b) get them to offer anything.
In the past I've managed to get banks to cancel arrengement fees on mortgages (£500) and credit me with £200 for constant credit card auth problems. Neither came close the the true cost to my disrupted business.
Honestly. I'd take it.