nazn wrote:
My problem is working out a datum at the garden entrance (there are no
gates!), I can see this being the area of contention as I would like
the wall to be near as dammit 90 degrees from the house wall, its how I
achieve this easily that is taking up the time.


Your conveyancing document will describe the layout of your plot. [If you're
lucky there will be a plan of the plot; if not there will be a word-portrait
of the plot ... having a frontage of nnn feet on the south side and a depth
of nnn feet ...etc.]
There is insufficeint information in your posting for anybody to deduce
whether or not the boundary of _your_ conveyed land plot is at right angles
to your house.

Check that your 'line' equates to your conveyance boundary ... it's feasible
that _your_ plot is a itsy-titsy thin triangle ...

--

Brian