An Atomic 22 bolt is a lot better than a ball bearing, although admittedly also a lot more expensive. You can get ball bearings in small quantities off eBay but some hardware shops might have them.
Remember you'll need to block off the seatpost rail clamp bolt(s) as well as the clamp bolt in the frame (and that it would still be quite easy to saw the post and deal with the bolts later). Brooks saddles are a nightmare in London tbh. Total theft magnet.
An Atomic 22 bolt is a lot better than a ball bearing, although admittedly also a lot more expensive. You can get ball bearings in small quantities off eBay but some hardware shops might have them.
Remember you'll need to block off the seatpost rail clamp bolt(s) as well as the clamp bolt in the frame (and that it would still be quite easy to saw the post and deal with the bolts later). Brooks saddles are a nightmare in London tbh. Total theft magnet.