Finally managed to swap out both rear discs as I managed to pick up some Febi Bilstein rears delivered for £25.95 from Amazon, which is far better than the £45.95 I paid for th wrongly sized ones I had last weekend. Used the blowtorch again and the spline bolt came out so much easier this time on the passenger side than the absolut ball ache th drivers side gave me.
I bet the ride quality on 16s is quite pleasant!