Many thanks for this. I have one more question:
The wording of my original deeds is rather imprecise. Although it says that the expenses for the maintenance of the building are divided equally between 3 flats, it does not say who arranges the repairs and who chooses workmen. The problem never arose before as there had been a very harmonious co-operation with the previous freeholder. While she usually instigated the repairs, there were appropriate consultations and decisions were made by consensus. Not any more.
Can freeholders impose their decision on a leaseholder (without consultation, without giving any details about prospective workmen or the extent of work to be done) and demand payment?
I have at least one more important question. For this you might need to know the background of the case (I have a resume) . What is the best way forward?