Bewildered by the variety. Lots of makers. Quite a few intermediaries.
Any recommendations? Any non-recommendations?!

I think I would like a pent roof to collect rainwater. I do not do much
work inside the shed (I have a useful extension). Inclined to go for
tanalised (anti-rot treatment).

Standing it on some sort of plastic bricks (the old one suffered from
"rising damp") such as "8' x 6' Shed Base Kit incl Weed Fabric &
TruePave Grids" from premierbarriers.co.uk

Not worried about installation. It is to replace an existing (30 yo)
shed which is composting itself.

As an aside, is it really necessary to paint Tanalised shed? I gather I
cannot do it for a while, and it is going to be hard to get to two sides
once it is installed. Natural wood effect is fine by me. I tend not to
use suppliers like Homebase/Wickes/B&Q for what seems to me an expensive
and specialised product.

I have looked at:

www.shedstore.co.uk
"8' x 6' Forest Epping Overlap Pressure Treated Pent Wooden Shed"

http://www.beastsheds.co.uk
"8x6 Apex Tanalised shed"

gardenbuildingsdirect.co.uk/ "BillyOh Master Tongue and Groove Pent Shed"

shedswarehouse.com
"Aston (BS): 8FT x 6FT Reverse Pressure Treated Tongue & Groove Pent
Shed With 3 Windows + Side Door + Safety Toughened Glass"

Thanks in advance for any suggestions.

Bill in Gloucestershire