In message , Nick
Gray writes
snipped

I can see that I will have trouble in getting the screws in as well as
drilling the holes. I've been provided with 10 x 2" wood screws & rawl
plugs to be placed three each side of the 8' x 6' base and two each end.

That sounds about right, but make sure you use brass screws, as it's going
to be in such a damp area, steel screws will rust.


I'd use Stainless steel screws which are pretty easily available
nowadays, easier to drive in as less likely to mangle the head.
--
Chris French and Helen Johnson, Leeds
urg Suppliers and References FAQ:
http://www.familyfrench.co.uk/garden/urgfaq/index.html