Its an 18". More pics.
The main problems are the drivetrain looks to be original and is quite worn, the middle ring has lost the odd tooth, but it does all work. The rear brake has some random grabbing action as the wheel rotates, suggesting the rim is plenked.
But the main problem is in the photo below. The bike was described as having a ding in the down tube and i did see the photos before i bought it. My initial thoughts were that it wasn't a ding and that it was actually a split in the frame.....it is split. I'm not fussed though, i'm going to ride it and keep an eye on it.
After all the entire bike was £100 posted
so even if it dies quickly i haven't lost anything in the grand scheme of things.
Right i'm off to fit the semi-slicks for tonights commute to work and see if i can fettle that rear brake/rim.