The search function on this site really was very good but I notice that it has been removed.
The site can be searched using Google by entering the following into the browser address bar:
e.g. site:https://www.cmlsupport.org.uk/forum imatinib
It certainly hasn't been intentionally removed!
It's showing up fine for me on my phone, but we have made some technical changes in the last few days so perhaps something inadvertent happened.
Are you browsing on phone, tablet or computer? What browser etc. I'll look into it.