Wot SXTY said...
Some of the perimeter hotels offer crew rates, that may or may not beat the public rate, so caveat emptor, and there are a fair number of crew only B&Bs with bus/walking distance. Somewhere between £25 and £60ish a night would be a fair guess.
The impact in days off is a bit trickier, though not so bad if you are part time and/or long haul.