Actually I would say that they are lower that in the U.S. Again it depends on where in the U.S. you're talking about but I would say that £40 is entry level, £50K is for a intermediate level £70K for senior and £100K is pretty much the max before you hit management.

I would say that salaries like this are pretty much on par with most major metro areas in the U.S. (not just silicon valley)