I've been on BB L - 10Mbs - for pretty much forever - since it was 512kb

paying £25.25 a month. Happy with the BB as it is. No phone or TV
Just noticed on the
website that they're offering it for:
- £21 a month without phone
- £26.49 without phone (??)
Plus there are introductory discounts.
So it looks like I can get a better deal if I take out the basic phone. But with Skype & free mobile minutes I'd probably never use it. And I really don't want to be bothered with an engineer visit.
So would I actually need an engineer visit? At the moment the BB comes into a box called a QAMTEX VQ601 TV/DATA ISOLATOR, with a single IN from the brown box outside and a single TV/DATA out to the modem, with no other sockets. Are there any extra gubbins I would need, and assuming it's just a case of plugging cables into boxes would they send me them or could I buy them from Maplins?
And would I also get the intro discounts since I'm out of my initial contract period?
What I don't want to happen is to phone VM up, they say it's an engineer or nothing, I say nothing, they say 'OK then, no phone, so its a price increase!'
So what are my best options?
Thanks
PS - I know this could equally be in the installation forum, but I figured it's more about changing services than the installation.