Yeah, I find it weird also. Literally no one sells pills in the UK. I find the odd friend who has some codeine or tramadol lying around but other than that it's unheard of. I mean, you can get Dihydrocodeine and Diazepam and other pills usually from heroin dealers but they always come loose so I'm 99.9% sure they're fake.
I recently tried heroin and I snorted it but I only had like two lines out of a 20 bag and I felt horrible the morning after. Just a really dirty body feeling and even when I was high it was different compared to codeine high. I just felt fake and dirty, also left my nose sore as fuck for 3 or 4 days just off two lines of the stuff so it's not really worth it for me. I just get my stuff off the darknet now, expensive but whatever. It's cheaper than buying bottles of Codeine Linctus
You should count yourself lucky getting 120mg Morphine daily as well as finding a source for Oxycodone and Morphine. I'd kill just to get 30x30mg codeine monthly from my Doctor for actual pain from falling 40 or 50 feet and spending 5 month in a hospital due to injuries but the best I can get is Naproxen.