P@H in Lincoln South have got a similar fish to this in one of their tanks for £19.99
It is labelled (on a cutout photocopy) as L171, yellow spot Ancistrus and says it will get to 10cm, when it doesn't look anything like an L171
Good old P@H, you can always rely on them for accurate labelling.
Looking on planet catfish it looks like it is a L115.
Trebor is a beaut by the way, wish I had more room in my tank.