The point is that your working alone and expected to be an expert.
As such, the salary should reflect that.

I do not think that the post will be filled by anyone from the NHS as they would already be on more than that and have a reliable stream of tea! anyone in a similar role would not want to move in this climate for an extra £1K or so.
Me, Geoff - I'm on less than £30K but have to go into renal unit where some techs are on far more than that and are not that good!
(don't get me wrong some of them are in the band 6/7 region and earn their money)