I am also in the UK (Stoke on Trent) and have a reasonable collection of Bolens myself. I have got 4 Bolens Tractors with Loaders. HT20 with loader (undergoing restoration at the moment), a HT22D with loader, both of which have rear 3 point linkage and i managed to drop on a genuine power steering kit which i'm going to fit the the HT20. I also have H14 with loader and a G14 with loader which definitely needs restoration but is all complete. I have many other tubular frame tractors: G8, G10, G11 (with rainbow decals), G14, H14, H16 i also have quite a few attachments for these some of which are quite rare. Not managed to find many attachments for the large tractors though, only have rotavator and mower decks. Have HT18 & 2x HT23's. I am really envious of you having the backhoe attachment, i saw it advertised on Gumtree late one night and was going to call about it in the morning, but looks like you beat me to it! Would you ever consider selling the backhoe? My HT20 with loader (which i'm currently restoring) was in VERY poor condition, all rams have had to be rebuilt, the tractor itself got broken for spares and transferred the loader to another HT20 which is also being restored. Mine spent many years out in the field in Inverness. Seeing your photo's has encouraged me to get mine finished!!
Welcome to GTtalk.
You have a very nice collection of tractors there! Would you be willing to post the modals and serial numbers of the tractors you own here?