Many thanks for your prompt reply. I am dealing with two lots of solicitors, firstly those who deal with freehold matters for the freehold company (although I am paying them for this lease extension work), and secondly the solicitors dealing with my flat sale and purchase, and currently the latter are simply waiting for the new 999 year lease to be registered by the first lot.
What you say suggests it is the second lot, i.e. my flat sale solicitors, who should also deal with the lease extension, in the way you indicate. Is that correct?
(The person dealing with my case at the freeholders' solicitors did mention at the outset something about it being better for my solicitors to do the lease extension. But I assumed they would have to go through the same rigmarole, which might complicate the sale.)
Very many thanks - First thing on tuesday I'll get onto the solicitors dealing with the flat sale and get them moving on this!
Also, I have rated your replies "excellent" and am content for this question to closed. So "over and out" (for now - no doubt I'll have more questions in future).