That is an entry level model, probably about 2nd from the bottom of the line. Stamped dropouts are indicative of a hi-tensile frame. Steel rims, stem mounted shift levers and swaged cotterless crankset are other indicators of entry level. The stem, brake levers and saddle are obvious replacements. The derailleur combination of a SunTour VGT on the rear in combination with a SunTour NSL on the front, if OEM, would suggest circa 1979-1982. If it was stock, I doubt that I'd consider this even at half the current asking price. However, that is one of my favourite saddles, so I might be tempted at about 100 GBP, provided it was local pick-up.