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@Dammit
You could (possibly- speak to a plumber) just fit a pump?
They are designed to give vented systems a big boost in pressure (from what I understand) and they crop up on eBay all the time for a fraction of their new cost.
The issue is (I think) that your system works by heating the water up ahead of demand, then it is released from a storage tank, hence you lose the pressure that it had when it entered the building from the mains.
Whereas a combination boiler (central heating and domestic hot water combined) heats the water "on the fly" as it were, so whilst there is some reduction in pressure the water is still ~80% of mains water pressure when it hits the shower head.
I have to admit that I don't know why you would need a cold water tank these days- going on the basis that I don't have one, and I live ~300 feet above the level of your flat, and my water pressure is great.
This is with me having replaced every single last bit of plumbing that was in the flat when we bought it a year ago, so I'd have spotted a cold water tank hiding somewhere I think.