Hi Matty, At first I thought it may be a low end Puch but more likely It may be a Tensor which were very cheap bikes sold direct by mail order in the 70`s and 80`s. They produced stuff like this `Lazer Custom` I had one as a kid and recognise the frame details. I think the frames were made in Germany by Kalkhoff? and then built up with very cheap components and sold by Tensor Ltd. They used to advertise with tiny box ads in the back of the sunday papers and exchange and mart . I dont want to offend but I would find a better frame especially if you havent got the forks. Whatever you do dont spend much on it.