It is difficult to find a well paid senior developer job in London. I'm not sure if this is the cause or effect of so many experienced developers becoming freel

It is difficult to find a well paid senior developer job in London. I'm not sure if this is the cause or effect of so many experienced developers becoming freelance consultants. Rates of £500-700/day for long term contract work with corporate / finance clients are fairly common, so you can easily double your salary vs permanent employment (or work half the time.)