OK, the chassis and body are separated! I had all the bolts listed in the manual removed, I had the seat belt mountings out too but I hadn't spotted the shock mountings inside the wheel arches as I still have the wheels on. With the shocks released at their top mountings the body will now lift free. I couldn't remove the bolt through the forward eye end of the left tie-bar, it seems to be rusted in, so I've removed the two nuts holding the bracket inside the car. I'm hoping that when we lift the body we can move ti forward so the bracket mounting bolts drop out.
All I need now is for the social distancing to end so I can get a few strong mates round to lift ti off! Meantime, I'll get on with removing the engine ancillaries.
Thanks so much to all who read this post and offered suggestions; very much appreciated! Here's a couple of pictures ...