I agree with some of the other posters here, £400 for the S&B could be worth it alone, particularly if it is a variable mag, German Model (as opposed to a Hungarian, nothing wrong with them at all but £400 is closer to their new price).
£400 for rifle and scope is a good deal, a similar package new could set you back £2500 depending on model of rifle and glass, so even one that needs a bit of restoration as opposed to major overhaul should be ok.
Good luck
Geoshot