Not necessarily the same but I had something vaguely similar from the opposite side.
I told my solicitor that I wouldn't do a specific thing because of a specific reason. He passed that to their solicitor who said that's not good enough (I had an electrician check and issue a safety cert when they had asked for an indemnity).
An indemnity in that situation is pretty much worthless. The cert I provided was a safety cert, an indemnity just covered legal fees if something did go wrong, it didn't mean it was safe).
I was in contact with my buyers and they were happy with it, their solicitor didn't even pass the info on - it wasn't what was asked for.
I also had an issue with a 'piece of land I didn't own according to the land registry. I had the original deeds that showed I did own it - it just hadn't been copied correctly when the land registry went digital.
I did sort it out with the land registry - it took 2 weeks. My buyer pulled out of the sale - for nothing.
Registries went digital around 1998. Lots of errors were made which they are happy to sort out. It wasn't however picked up when I bought the property in 2000 and only came to light when my buyers solicitors picked it up (the day before we were due to exchange).
If you can - it may be worth talking to your sellers direct - as with the sale that did go through, the electrics came up again but because I spoke to my buyers direct it was sorted. They had a similar issue with their buyers which was also unnecessarily held up by solicitors making demands that they and their buyers had already discussed and sorted