Found a departure from Bodø with Skedaddle on Saturday 23rd July that looks good ...
To get to BOdØ there is a reasonably priced Norwegian flight from LGW to OSLo departing on Friday 22nd July at 20:00 ... could then stay overnight at the airport before getting another flight on to BOdØ the next morning ...
On the return journey, there are a few different options to get back to London.