I can’t definitively answer your question as to whether they would look at the four fields separately but I would suspect it depends how it appears on the probate application form.
If it appears as a single ‘lot’ valued at X and the ‘lot’ ultimately sells for X + Y, then you would be liable for CGT on Y.
I know from my own experience that expenses related to the sale of a property itself can be offset against a CGT liability. These would include estate agents fees, solicitors fees, BER assessment fees and any other expenses you may have incurred to protect the property before it could be disposed of. Your solicitor will explain all this before the sale closes