Good that you are making decisions. Once you known where and to what - you have a better idea of your finances. However, you have so often said that you were not particularly happy with Northumberland on here, do be sure that you really want to stay there and are not just taking the easy route - which you could regret in the future.
Lots of places have nice beaches, and with things like U3A and WI, as well as specialist interest groups, it is quite easy to get to know local people. Also meet-ups from Gransnet.
Monkey World in Wareham is absolutely fascinating . Watch it on TV and went, with a friend, couple of years ago for my birthday. Really loved it, and will definitely be going again now that I am nearer. However, as you say Dorset is very expensive.
You may be surprised (pleasantly) with what your purchaser actually offers.
My children (particularly the eldest girl, who I lived close to) were also furious when they found out how much I had put the house on the market (and this was not the house they had all grown up in). But, I pointed out to her that as long as I could get enough out of my 50% equity to purchase the flat I wanted, it was silly for me to put myself through hell just to keep it on the market at a higher price. Looking at Rightmove, I see that the lady who wanted to buy my house right back in April, still has her own one on the market!!!
As has been said, any property is only worth what someone will pay for it. As I had four different would-be purchasres over the months from April - August - obviously, I was putting it at a good price.
I am still struggling with all the different organisations, etc with change of address. Do have re-direction for six months, and am gradually trying to contact different companies as brochures, etc arrive.
Finding it difficult to amend the address for my Tesco card. As I have had it for such long time, it is not registered on line - and obviously got it originally when I had a previous mobile phone. I have no idea what the number on that was -have not had it for some six or more years. But, because of this am having a real job getting them to accept my new address.