I'm thinking of putting this in for a Victorian house, in conjunction with some
new uPVC windows to seal up the house from the cold North winds.

The attic has access to every room in the house (via vertical channels running
down the sides of the chimney breats) so moving the air around should be easy
enough.

So - where to start? No suppliers seem to be able to provide any decent
information. They usually say "tell us what you want, and we will give you a
quote". I say "tell me what you have, and I will work out my own". In this
economic environment, I don't know why they are all making it so hard for me to
work out what I need.

Anyway - any suggestions on where I can find information on how to plan one of
these things? There are plenty of units on eBay (search for "heat recovery")
starting at £400, but I have no idea if any of them are any good.

Like any DIYer, I just want to be knowledgeable enough to know what I am looking
for, and make the right decisions. I suspect my total costs (for DIY) would come
to around £1500. Would that be reasonable?

What I'm trying to solve is condensation and mould problems in a large Victorian
end-terrace house, while at the same time keep as much heat as I can in the house.

Any tips - direct experience or otherwise - gratefully received.

-- Jason