Don't think you can sell it anyway until you've got confirmation - so cross that bridge when you come to it
One less thing to fight about just now.
Lack of confirmation delayed one sale of dh's mum's place, which had been agreed subject to concluded missives. They ended up taking it off the market until they got confirmation a year later - and sold for a lot more 
Dh and his brother got hold of his mum's bank accounts going back 7 years (as far as the bank could give them) and dh, SIL and I (BIL lives down south) went through them with a fine tooth comb. Turned out that SIL had been skimming her mum's account for years (even before she officially had PoA) as she had her mum's bank card. There would be a cash withdrawal of £50 (for MIL to give pocket money to the grandchildren) and another one for £300 for SIL's "pocket money" 
When she was challenged about some of the recent withdrawals, she tried to claim that some of it was for ds' replacement computer (he'd had his laptop stolen on the way back to uni). Umm, no - MIL had given us a cheque for that (we'd already started having suspicions that she was doing something like that so made sure we had paper trails - and cashed the cheque straight away)
. She then tried to blame my nice SIL's dh 
She then tried to claim that the cash she'd withdrawn while her mother was on her deathbed was for a "cushion" 

. We also later discovered she'd been claiming carer's allowance
- despite expecting my nice SIL (who works full time) to do all the "caring" and who was the one who took her food shopping (although there were lots of very large Morrisons' debits on different days, including when MIL was in hospital
)
It was well into 3 figures over the years - and there are still some large transfers unaccounted for.
We're convinced that there are assets we've missed.
Thieving SIL is lucky the other siblings didn't go to the police. They made her pay the other three some money back out of her share of the assets (personally I think she agreed far too quickly and they should have gone for more).
She's lucky they didn't go to the police - she could (and should) have gone to prison 
Former STV host jailed for stealing £120,000 from her mother https://www.bbc.com/news/articles/cyx022de4qno