The financial services industry is more than just banks, but in any case London has Natwest, LLoyds/TSB and several others. They also have a controlling interest in RBS, which since the financial crisis is now mostly owned by the British government.
As much as I am enjoying our little conversation here, there comes a point where someone needs to admit that they are in a little bit over their head and arguing for argument's sake. I'm afraid that you have just reached that point. Your original point of contention was that Scotland's financial services industry is insigificant, which is simply not true. Your most recent post here makes it clear that you are unaware of the fact that (1) RBS owns Natwest, and (2) the British Government (of which Scotland is still currently a part) made similiar investments in both RBS and Lloyds TSB as part of the 2008 UK rescue package.