After a stressful week trying to find a way forwards things are now back on track.
The foundations have been redesigned to a hybrid raft that can sit over the existing strips. Steel shafts will be drilled into the existing concrete footings and then a 300mm steel mesh reinforced concrete slab will be poured over the whole plot to form the raft.
This will of course be more expensive than the original plan and I am yet to have my conversation with the engineers over the costs.
Meanwhile the ground workers have completed the third ground source heat pump trench and the full set of pipework should be ready for pressure testing on Monday.
One more week of mud and we should be on our way.