I understand that there may not be enough ground level room but unfortunately I do not have the room to accommodate such a big cage. There is an 8.5 inch wheel actually, and I will try and post a link here. This cage is the best I can do and is far bigger and has a lot more ground space than most cages.
Thank you for your reply
https://www.amazon.co.uk/Superpet-Si.../dp/B0013KA8DA