Thanks for that.
From what you say it appears the bearings have gone in your appliance.
It's a major job to change them (If you don't have the plastic welded tub).
The entire tub assembly has to come out and then that in turn has to be taken apart.
You need to have bearing puller and insertion tools too.
If it's the welded tub, you have to change the entire assembly.
Hotpoint will repair the appliance for a fixed sum (Just over £100 last time I heard) and this includes all parts and labour.
You would have to call them to get their latest price.
If you want to try and do it yourself, let me know and I'll try to help you as far as I can.
Hope this is of some help
Let me know how it goes or if you need more help