I don't know what the debt is like in the UK, but a doctor in the US can expect to go into upwards of $200k of debt.

The average engineer will have far less (or no) debt and will only need a BA/BS.

Average debt for UK junior doctor is "over £40K".

http://en.wikipedia.org/wiki/Junior_doctor

no I meant a chartered engineer with several years experience and a senior role earns far less than a GP does.