"........... I'd look at burying the pipe maybe 9" - 12" deep in a place I'd
not normally dig over .........."

I would try for 15 to 18 inches if possible. After all it may not always be
you "Not digging",

You should use the blue "Water" pipe, and remember you can always put in one
or 2 "T" joints to have a couple more taps down the length of the garden.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk