Ive had my car lowered on coilys for abit now, im getting a knocking noise and creaking noise from the rear end,just wonderd if it could be the rear axle bushes?

It could be the beam bushes, but there are other things it could be too. For instance, the rear bench being slightly loose, or the exhaust rubbing (if so suspect a weat or torn rubber). It's really the sort of thing you need a calibrated ear passengering to diagnose.

When I replaced mine they were worst for wear.

I got a set of these: http://www.ebay.co.uk/itm/SUPERPRO-REAR-BEAM-AXLE-PIVOT-BUSH-SKODA-FABIA-Z1168-/260794631608?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3cb89245b8#ht_1293wt_905