[MalteseFalcon]

The best thing to do is look at SKY and BT, make notes on what their monthly cost is for what you want, call retentions and speak calmly and politely. Stress you are happy with them, but because money is getting tight you have been looking at ways to save money. BT or SKY can do pretty much the same as Virgin provide, but because you are happy with Virgin, what could they do to cut your bill down.

I did this for a relative a few months ago and she had £25 a month reduced from her bill, admittedly most of that was because she dumped movies from her package.

In short, research your other options, be polite and stay calm.