In my own opinion, FWIW, that guide price range is about right.
The mileage would make it a steal @ £45K given recent article discussed on this forum and elsewhere.
A sale @ near to £55K would represent the breaking of news ground for the values of 60-70K mile car...
(If it make £55K though, mine will be avilable for £54K but only for one day, then the price goes up again !!