Sadly rifles like this loose money very quickly. Everyone wants new/plastic/moderated etc.
I would say, if you find the right buyer who is after something like this then that will be great for both of you but it may take a while. Good calibre for this type of rifle so that's a plus.
Personally, I would consider any offer between £150 and £300, I know that's probably a lot less than you were hoping for but it's a tough Market place at the moment. Your first loss is usually your best one.
Two possibilities; maybe ask if anyone fancies swapping it for some other bit of kit or some stalking etc? Also, the action has a value on it's own, do you fancy a short action new build project?