I need to buy a lot of MDF to make a loft more useful binging some partitions inside it , does anyone know any good reseller around South London?
I never worked with MDF , is there something I should know?
MDF , where to buy?
Whitten Timber will help. but if you’re doing partitions, you’ll be much better off using plasterboard and studding.
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Plasterboard walls, and TNG Flooring presumably is what you meant?
No, the floor is done but everything else is half arsed , I want to close shout the sides , where the hight is not tall enough for anything mostly because the flooring is not there and there is only the insulation, I don’t want to risk to get anything through the bedroom ceiling 
Plasterboard and studding is what is designed for this sort of application.
Otherwise I’d go OSB over MDF which isn’t very good structurally.
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It’s also a hack of a lot easier to work with in this sort of tight space - any board that you can cut with a blunt spoon and a karate chop will save you hours of cursing and anger in a loft
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In a loft you also need to consider ventilation, otherwise you can get condensation/mildew/rot. Moisture will pass through the ceiling into the loft unless it has a vapour barrier, which is unlikely. If not blown out, the humidity can easily rise to 100% in the low temperature and then you will get condensation. There needs to be a through-draught.
There is a decent , professionally made , insulation between the roof and the ceiling , but is good point , I have no windows but I can see the exhausts vents for the bathrooms , maybe I can hook something there…