It is recommend bc bps will choose security over regulating there body temp correctly. If your hides provide the same amount of security you won't have that problem. I did have this problem until I switched to RBI hides
To the op, reptile basics hides are popular in the US but I did find a UK seller of similar hides. If you choose to get these I would get the medium like in the link I provided. A snake will quickly outgrow the small, you can stuff the hide with moss to make it more snug until your snake grows into it or you can get small. There is other suppliers in the UK that have these so you may be able to find them cheaper.
http://www.wildworldreptileshop.co.u...e-hide-medium/
Sent from my SAMSUNG-SM-G890A using Tapatalk