Bottom line: it's great that you're enjoying diving and have great enthusiasm. There's so much more to diving though and once you've developed great skills (starting with buoyancy, trim, finning) you can then enjoy the diving.I will look into that [tech diving] too, someone suggested it
If looking at UK diving it tends to be deeper, typically below 30m/100ft, in cold water (i.e. drysuit), tidal conditions (drifting away from the shotline), dark (need a torch+backup), with frequently poor visibility where self sufficiency is vital. Because of the depths decompression is very common and requires additional equipment and skills, not least planning. In essence it strays quite quickly into what's commonly known as technical diving, e.g. below 40m/130ft and decompression.
BSAC are well equipped for this, but so are many "dive shops" with allegiances to recreational agencies.
The main thing is to get the practice in and go diving! The UK has some amazing diving just on our doorsteps. Alas we don't always have the weather.
As an aside, the SDI Solo Diver course has higher entry requirements (100 dives plus a mature attitude) than the DiveMaster course (60 dives). Aiming to do the Solo Diver is a way of ensuring you've the right skills to keep trouble away.