Got my letter about the increase today, it reminded me to contact them to cancel my TV and Phone, which I've just done. I'll be saving over £20pm after the cancellation kicks in, mid-December.
BTW, the increase on my bill would've been £3.25pm, I think VAT needs to be added to that though? Which would make it £3.90pm
http://www.vatcalculator.co.uk/