I'd go for a multipurpose mix with added john innes no 3 to open it out a bit. I would add a small amount of slow release fertilizer granules to the compost mix.

I would trim some of the roots back and then reduce the top 'growth' down to about 18" to encourage it to make new growth from the base. keep it well watered but not waterlogged.

I wonder if it is one of the evergreen honeysuckles but that is one heck of a price for a climber. worth giving it a go.

I agree with SeaBG, but think I'd leave top growth on until you are sure it's dead, just in case it's something that does not like haircuts

Not in same class as your rescue, but I bought a Lavatera "Barnsley baby" from Wilkinson's, 10p down from £3

It was dried out & crinkly & on it's last legs but overnight in a bucket of water & now it's at least looking slightly better if sorry for itself

Nothing much more satisfying than a bit of plant rescuing

I would recommend liquid seaweed extract to feed it. Its a great growth stimulator and is particularly good for roots. I use it on everything. Its also organic and sustainable.

You say you have washed the roots, was this photo taken before you did that?. It seems to have been in a container which was too small for the expanding roots. They appear to have been going round the inside of the pot. If it was in a pot then transferred to the ground without teasing out the root ball it may not have developed enough new small roots to pick up on any water that might have been available to it. When planting pot grown plants I always did a hole much bigger than the original root and prepare the hole by mixing the compost with some bone meal. I then ensure it is kept well watered for the first months. I do hope you manage to save it because like the others I'm dying to know what it is to justify that kind of price.

Well I have gone and done it....cut it back to about 18"...potted up with a sprinkling of BF&Bonemeal,did a bit of chanting around it...so lets see. Yes its very satisfying to rescue a plant...I love to have a go.
It actually was bought by my daughter...yes £80 is a lot of money...so is £20 come to think about it... will check that one with her. Some shrubs do fetch that price tho...I saw a Tree Peony in a 2 litre pot at the Spring Garden Show Malvern asking price £65.00 I nearly fainted as I have a 4ft tree in my garden...whats that worth ??. Anyway Thanks for all advice will keep you posted. Best Regards Carole

My OH reckons if we ever sell the house we should sell the garden and give them the house. It is quite frightening to check the value of year round pleasure. I always try and buy small plants as they seem to take better. We have a famous nursery specialising in Paeonias locally and I love visiting it but do leave my purse at home LOL.