Well, damn. I thought you were joking! I'm not surprised it's £100+ - took us about 15-20 hours in total to dig up. We were going to chop it up for firewood. Suspect there's an inadequate amount of root on it, though .a well tended stump say after 10 years of training can sell for big money !
Probably because it was an Oak (Q. cerris), they famously transplant really poorly, even when they are small. When I worked on the nursery (on the open ground), digging up trees in the winter they were one of the few deciduous trees which <"were always root balled">.I dug up a 37 year old turkey oak (i counted the rings) two years ago after preparing it for 5 years, it was looking good last year showing a few new leaves but died this year … normally they survive.
............Root balls are particularly useful with species which are known to be difficult to transplant. Such species include Betula, Carpinus, Fagus, Liquidamber, Pyrus, Quercus and Robinia...........
It had a terrible spring with one tiny flower which I did cut off. Snails kept eating it and didnt let of until recently. I suppose this combination is why its flowering nowDid you cut the lupins back after the first flush of flowers Wolf? If you tidy them up after they first flowered, removing the seed heads, you can get a smaller second flush of flowers. The slugs tend to prune mine long before they even get their first flowers unfortunately.