Revamping my central heating setup...

I'm thinking about revamping my central heating setup...

I currently have the following (I think):
- G/Floor Kitchen: Potterton Boiler (Profile)
- 1st Floor Office: Hot Water Tank
- Loft above office: Water tanks
- 2nd Floor Loft Rm: No Rads
- This is set up as a gravity fed system.

My thoughts for improvement are:
* Keep the boiler
* Convert to pressurized system
* Move airing cupboard / hot water tank from office to loft
* Change to a multiflow system
* Puts some rads in my 2nd floor loft room

I belive that I will benefit as follows:
=More efficient/better designed system
=More space
=Rads on my top floor

Is this a good idea? Is this a flawed view?

Thanks.

* Change to a multiflow system

Click to expand...

You wot, mate?

Yes. I'm a little confused.

I think what I really meant is a pressurised system with a megaflow (or equivalent).