[user5994461]

40k and 42k are definitely not average salary (at least not for anyone who can do an interview on a whiteboard).

People get that out of [good] colleges for a first job, ignoring the students who do get more than that.

[okey]

Got any data to support that? (If you do, it makes my point even stronger...)

[user5994461]

All salaries data from my current company + [Counter] offers from other companies for people who are either joining us,leaving us or being poached. Nothing I can publish I'm afraid ^^

It ranges from junior out of college to senior with many years of experience. That only includes people who can FizzBuzz though.

IMO: I'm a firm believer that anyone with a clue who's offered 35k£ for that kind of role should just stand up, thanks the interviewer and leave.