Where to start???
This is so you can fill out the forms correctly, not to have a go
Page 1.
I'd probably be a bit more descriptive of what you have done.. e.g. "CU change inc. upgrade of tails, main earth and bonding to gas & water"
and then in the limitations.. CU change only!
Also if it is only a CU change it's only an alteration
Page 2 is fine
Page 3 (schedule of inspections)... are there really some "cables incorporating earthed armour or sheath......."
Page 4
On the test equipment bit you need to put the instruments serial number
In the Overcurrent protection TYPE box you'd put BS 3036 (rewireables), BS 1361(cartridge fuse), BS 88 (cartridge fuse), BS 3871 (old MCB), BS EN 60898 (MCB) or BS EN 61009..... you could put "B32" etc in the rating box
I'd also strike through the boxes & lines that you are not using..
HTH