The RA Recommended Channels

09 - Emergency Channel
14 - Breaking Channel
19 - Mobile Channel
31 - International Calling Channel (CEPT Frequency)

Other "Specific Use" Channels

03 - Charlie 3 Group - Local to Swindon (no longer active)
23 - Southampton Area - Traffic Directions (not constant)

Using the links on the left you will find the codes used by Amateur Radio enthusiasts and CB'ers alike.