Bother I just refreshed and lost my lengthy reply!
@pimplebum and @Lamelie it's around £40/hr and she took four days but not the whole day (only a few hours per day).
You have to be there and you can either help or let her do it while you advise (I helped).
She says I was very decisive (DH and DCs may think too decisive...) so I think she may have ended up in "discussion" with other clients that wasn't quite as amicable. So I think if you spent ages debating (with yourself) that might take longer @heldinadream
@KickAssAngel She leaves you with bags of "paperwork/undecided" which mainly has turned out to be shredding so after the DCs tried to help we now have a new shredder...
I was kind of expecting it to be item-based like Marie Kondo but it was room-based and we started in the cellar. We ended up not doing all the rooms (I did my DD room myself on another day, with DD helping, using the same system, I had already changed over winter/summer clothes which usually involves a load of charity bags, and we didn't do DS room as he doesn't have that much stuff though we did use some of her recommendations to give him different storage.)
@FriedEggChocolate A local contact told me about this one that works in my area, she actually came from about 40 mins away so I did pay mileage. If it's for a relative I think they'd need to be present/on board to some extent. I searched for this particular company but found another one in the region. I'm in the NW but not in a big city.
I have to dash but will check back later!