Saintsman
You are missing the point. We cannot afford to purchase the 20-ish KA330s that we need NOW. We might be able to afford an incremental procurement of X number per year for Y years and introduce them slowly and affordably. Even the USAF are looking at in the order of 17 KC-Xs per year for a number of years!!
GLGNDB
Fine idea but too many pax only A330s and not enough tanker A330s in your suggestion. And could we have the freighters as tankers as well? I would suggest 10 x KC30s (boom, centreline hose and wing podded), 8 KA330s (with wing pods) and 2 KA330s with a VIP fit (and the ability to fit wing pods). Then perhaps we could rightfully have the honour of transporting the Boss of Her Majesty's Flying Club again!!