After many months of using 10Mb BB through my Samsung box - not having wanted to pay the £50 ntl: originally wanted to install a CM , I bit the Bullet today and contacted CS about getting a self install CM kit.
The CS rep I spoke to was very helpful, and after the usual security checks passed me directly to Sales who deal with the kit shipping (I guess it's used more for new customers).
The guy in Sales was equally helpful, after confirming that I really did need a CM he organised shipping, advised me of the delivery date (Tuesday by Parcel Force), gave me the PIN No. and then said Oh you dont have any discounts, have £10.50 a month ongoing - and I didnt even have to ask
Now I guess it will be the usual lottery as to whether it is applied but I could at least hear him typing somthing as he mentioned applying the discount