Read a bit on here about refurbing calipers due to sticking brakes etc, but want to change the pads but the piston wont wind back in (l/h is ok) so assuming best to get replacement caliper as don't know if reburbing would work, or worth the effort?

Are you using a windback tool?

They can be a bit temperamental unless they're aligned right:

My linkhttp://briskoda.net/forums/topic/139836-help-brake-problem/page__view__findpost__p__1751204

If that doesn't work then the caliper is something like £80-90 to replace, or the seal kit is about £30 if you want to have a go at re-furbing it

Thanks Chicken, yep using a tool and yep was aligned correctly (I did find your pic above when trying to do it at the w/e) it's stuck as stuck!

You haven't got a crushed brake line running to that brake have you? That'd stop it returning.

Easy enough to check, as if you open the the bleed nipple and then the piston pushes back then it's that.

Other than that it sounds like it's shafted! New piston/seals or just get a new calliper like I did. Got mine from here: http://www.vw.car-brakes.co.uk/

Or smack it with a huge hammer until something happens/breaks!

Ooo I don't know... I don't think so but worth a look, typical above link they are out of stock of green ones lol

Seal kit for rear axle from skoda around 15quid thats 2xseal and 2x dirt seal, if you require part numbers I can find out m8.