Ok so I've upgraded eventually to 1.00.23 this morning. What diffferences will i see?

You'll find others' experiences here -> http://www.digitalspy.co.uk/forums/s....php?t=1269318

It depends on what version you had before.
http://www.humaxdigital.com/uk/suppo...ategory_seq=56

Besides the feature changes, the box should not suffer from slow remote responses as much as it did under V.1.00.21

Yeah I had version 21 before and the past months have been a nightmare - very sluggish performance, difficult to get menu bottons to operate. Seems much improved so far.