Well, we have a photo but it's poor resolution and taken from from the non-drive side. The OP is also in the UK, complicating identification for most members, who are located in the USA. However, the graphics, in combination with an internally routed rear brake cable and 700C wheels suggest an upper entry level, sports model, circa 1986-1989. The serial number will indicate the exact build date.
It's been substantially modified, with at least new handlebars, a front dual pivot brake caliper and brake/shift levers, though curiously the latter don't appear to have the shift mechanism enabled as there are no shift cables coming from them and the old shift levers are still in place on the down tube.
It look like there may be a model name on the back of the frame's top tube. If not, photos of the tubing decal, rear brake caliper, derailleurs and crankset may help us determine the model.
