£25k is £25k
It's easy to sit there, having worked half your life and sneer at how pathetic the salary is considering the job description. I wouldn't do that job because I earn more than that blah blah blah.
This isn't the sort of job you would do forever, it's aimed at someone young and eager. So great, you wouldn't do it because you earn 2/4/8/16 times that salary, but you probably didn't when you were 21.
£25k is a good starting wage for a young graduate, the assumption that people should be able to go straight into earning £40k+ is worryingly prevalent amongst youngsters to the extent many seem to believe it's their right. Berating positions like this based on the money simply engenders this concept further.
If I were fresh out of uni today I would scrub toilets for £25k, so I would sure as hell fix wheelchairs and make some phone calls.