Just for completion. I eventually took the car to a local tyre place which is part of there Pro tyre group.
They had additional ramps which they used for the back wheels to level the car out as it drove onto the main ramp, therefore levelling the sils as it came over the edge of the main ramp so the angle wasn't did acute.
The alignment was well out, but now adjusted as per the spec for the car so good job done.
Not cheap at 96 quid but very pleased with their care for the car when they did the work.
C