Installing vent thru tiled roof

I find myself having to install a ventilation for an internal bathroom I'm building[1]. Unfortunately there's no alternative for the exit pipe to go straight up through the roof - no direct access to any external walls as it's a mid-terrace; and because it's also a corner terrace it would be tough (and unsightly) to reach an external wall via bozed in ducting.
So how difficult is this to do, and leave a sound, non-leaking roof? What's the best device for a newbie to use? Had a look on Screwfix but can't see anything. Roof has flat tiles, think they are slate.
Thanks David
[1] Just bought the place. This internal room has apparently been used as a shower-room of sorts. There is an old ventilation grill in the ceiling, so yesterday I went up to the loft to find what was on the other side of it; hoping for at least a duct and a broken fan maybe. I found a large ancient, galvanized steel box about 18" cube, firmly fixed down over the grille. Very curious. Box had several other grilles in the sides, and one had been prised open by someone in order to look inside. The contents... nothing, zip, nada. The only purpose seems to be to provide an air conduit into the roof space. Presumably building control must have been OK with that when it was fitted!
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If you have a soil stack already going through the roof, then use thjis. Cut it in the loft and install an air admittance valve. the the pipe pemnetrating through roof, use asa vent.
Also, measure the tiles on your roof. There are special vent tiles available. Go to a builders merchant for one of these. Just slip out a tile and slip in the new vent tile. They look very neat.

You are now not allowed to vent moist air into the loft. Seal it up.
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"David" wrote | I find myself having to install a ventilation for an internal bathroom | I'm building[1]. Unfortunately there's no alternative for the exit | pipe to go straight up through the roof - no direct access to any | external walls as it's a mid-terrace; and because it's also a corner | terrace it would be tough (and unsightly) to reach an external wall | via bozed in ducting. | So how difficult is this to do, and leave a sound, non-leaking roof? | What's the best device for a newbie to use? Had a look on Screwfix | but can't see anything. Roof has flat tiles, think they are slate.
You can get all-on-one flashing / tile infill / fan outlet things in the builders merchants.
Using Internet Explorer (probably) visit www.ubbink.co.uk and let your mouse hover over Domestic Fans & Ducting - Accessories - Roof Terminals
From then on their coding did something bad to Opera, so I can't see what happens.
Owain
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