Just a little update.
I followed my farriers advice and he was right and im now much happier.
It was all my fault, over the summer what with haymaking, the heatwave, lack of rider for chunky and him being lame. I just completely lost my enthusiasm to get the horses out for there inhand walks. Consequently the hoofs just grew. The back ones in particular. The pictures dont show how long they had got. I reckon at least 1&1/2cms of rim.
When the farrier came out 6 weeks ago i asked him to take a look and said i felt they needed a trim. It wasnt going to help him with hid hock injury either if the feet were badly over grown.
Farrier wouldnt trim, and told me to get him out on the road track and his feet would soon wear down and break off. Well i did as he said and sure enough they have worn back down. I wasnt to happy about them breaking off, hes always been fairly tidy on the feet and i didnt want to create big splits in the hoof wall, hes lame enough with his hock, which is why i felt they needed to be trimmed. I guess i now know because hes not walking on the rims anymore. So hopefully better weight bearing, using more foot and applying pressure through the frogs etc for better blood supply.
So at least it should now give me that insentive to keep walking him out and not let hisfeet get that long again.