That’s nice of them to leave that there. But, you know, there probably won’t be a model name or type. It would most likely have been custom made for the customer. It looks like an ‘all round’ geometry. Not exactly steep angles or short wheelbase and plenty of room for mudguards and a rack. Fairly small size. Or at least a short head tube. Particularly nice seat cluster / fastback stays.
But can’t see much more from the picture - Reynolds 653 or 753? Whichever way, good tube set. Maybe Mavic SUP Ceramic rims? Maybe early 90’s Campagnolo Chorus shifters?
You can probably see all of that easy enough and it’s fairly easy to look up info on Roberts/ Reynolds / Mavic / Campy online. And Geoff Roberts still makes frames in Sussex.