Hello Fellow Derbyshire Person :wave:
I have read you're other thread about the vet advicing you drop the pellets from your buns diet, I would recommend reducing them slowly and not dropping them all together. A buns diet should only contain a small egg cup full of pellets a day, mine get this in the morning and then the rest of the diet is hay and veg.
I recommend that you visit the hay experts online
https://www.thehayexperts.co.uk/Hay...+Herbs.36/Taster+Selection+Sample+Pack.6.html
This link is for the taster selection pack, which you may want to get so you can see which hays they really love. My buns recommend the Orchard Grass
The best hay is always best decided by your buns.
I'd also ensure you avoid sugary foods such as carrot and fruits if you're looking for your buns to lose weight. Don't worry about your vet making it seem like a rushed process, you can't and shouldn't rush this process with rabbits.
I hope that helps
xx