I think the thing is with lawyers' salaries is the growth potential - starting salaries can be low and once you have 'proved' yourself and you start to bring in work, can go very high. So, the salaries you have seen may be just starting salaries?
The average UK salary for all employees is £27,000 p.a., so I would guess most lawyers must be earning more than that ... I just found this article from 2002 ...
Legal Week Students reports
Those entering the legal profession can expect the highest starting salary of any graduates, a new survey has revealed.
Research by the Association of Graduate Recruiters (AGR) reveals an average starting salary in the legal profession of £28,000. This is significantly higher than the second-best paid sector, banking and finance, where the average starting salary is £23,500.
The average graduate starting salary across all sectors is £19,600, an above-inflation rise of 4.2%, with the lowest starting salary anticipated in the accountancy sector (£17,500).
A quarter of companies now offer ‘golden hellos’ to attract top talent, although the top law firms have yet to employ this practice.
Author: Legal Week Students
Source: Legal Week Students
Start Date: 03/11/2002
End Date: 31/03/2003
So, don't worry on behalf of UK lawyers - it seems they're doing just fine!