I'm going to get those that you've linked from Screwfix they are the best combination of height and storage and I don't fancy going any higher than that
Get them from the parent company B&Q, as they are cheaper at the moment. Sign up to the the B&Q club thing and they send you a £5 off voucher making them even cheaper.
https://www.diy.com/departments/mac-allister-18-tread-combination-ladder/3663602604624_BQ.prd
Dave