So started the big lift.
Couple of precautions:

1) don't climb under the car!
2) Brace the doors (so the car doesn't fold in half). In my case I have used the doors (which will not be opened while th car is off the chassis!). You can also use braces that bolt between the A and B-posts


Set up with 4 X 2 Tonne bottle jacks at the front and back of the sill on each side. I used some pieces of 2X4 wood between the bottle jacks and the sill to protect the sills.
Then slowly lift the body from the chassis. Each time the bottle jacks are fully up then I supported the body on jack stands and placed concrete blocks under the jacks to raise them

Eventually it was possible to put two pieces of timber through the wheel arches and use these to support the car i continued to raise it on the jacks

Now, one mistake... Should have backed the car into the garage as you need to lift the car further to allow the chassis out backwards from the car..
Eventually it did get high enough (720 mm at the sill! with the distributor and heater tap assembly removed to give a little more clearance).

Now I needed to manoeuvre the chassis into the nextdoor garage. This isn't that easy as it is very hard to steer the wheels without the steering wheel. However a simple trick makes it easy, place 2 old car magazines under each from wheel. This reduces the friction between the wheels and ground and makes it easy to steer them.