@Yippeeforme no response :-/
So the long story is that this 'dream house' was the first one we saw after selling originally. We were a bit green/naive and unsure how much to offer.
We were told she would accept a certain price and didn't want a bidding war, so we offered it and felt happy knowing it was done. Only another buyer turned up. The EA was extremely aggressive saying we would have to see their advisor to be considered a serious buyer. We couldn't tell if the other buyer was even real! So we made one last offer and walked away. We instantly regretted not offering more but it was already too late - she went with the other buyer who'd offered a little more.
Weeks pass...
We suddenly lost our buyer due to Covid factors, and a new vendor we were in a chain with. The same week, the dream house came back on the market, having lost its buyer too. The EA rang us and said we could make an offer even though we hadn't sold yet. We were the only ones interested. We offered asking price and the same day another buyer popped up offering lower, but proceedable. The EA/seller kindly said we could have a week to sell before they'd move on.
The property went off the market and our deadline ran out on Friday.
We became proceedable on Saturday :(
We have no idea now if the vendor will go ahead with their new buyer and lower offer, or will accept us being a few hours late and take our asking price. OR whether the EA will now stir up another bidding war.
We've accepted lower on our own house this time (as we were desperate to sell and be able to offer!), so we actually have less flex than last time, but more sure of ourselves!
The 'new' vendor we had offered on after we first lost the dream house is still on the market too, but they've put their house into some sort of auction where you have to pay a lot of money upfront, so I feel no guilt at not going back into a chain with them.