Ok, to post 21, yes initially the RCD was tripping, so I investigated this by going around the room, isolating each socket in turn and checking the live-earth resistance . I tracked the problem to a leaky junction box plastered into the wall (which I'm pretty sure was wrong as it should have been accessible for maintenance. That junction was just joining two lengths of cable so I replaced it with a new, single length of cable which I chased into the plasterboard. It was in carrying out this investigation that I noticed that when I isolated any one socket, a lot of the rest of the sockets would stop working, which is what started me wondering about the integrity of the ring.
So I spent my saturday mapping out all the socket connections - isolating absolutely everything and then testing the connections between each socket. I now have a complete drawing of the circuit in question, I know exactly what is connected to what, and I can assure that it is definitely two radials.
I did do the work myself but, being aware of my lack of experience of installation work, I checked all my plans with the electricians at work before I did anything, and got them to inspect everything I did, either in person or by photograph.
OP, please don't be offended, but I don't think you are qualified enough to be carrying out this work.
An RCD can also trip when there is a neutral to earth fault, and also when there is a fault on another circuit. When an RFC is installed, there are a series of test to be carried out to establish it has been correctly installed.
It would be unusual, but not uncommon, to find two radial circuits (for socket outlets) to be connected into one mcb. Hence the suggestion, that your circuit in question, was installed as a RFC, but somehow part of the ring has been disconnected, and you think you have two radials, especially as the original mcb was 32amp. I might be wrong. Unless the installer, forgot or missed part of the installation? Do you have two sockets with only one cable at each, but has continuity with the origin of the circuit (s)? This can be complicated by 'spurs' from your circuit. It is practice by some local councils, to turn a RFC into two radials, if a leg of the ring develops a fault. But the faulty cable would be isolated, and the two legs turned into two separate radials, in two separate mcb's.
When carrying out the installation work yourself, it should be properly tested before being bought into being. Having your plans checked by people at work, either in person or by photograph, will not facilitate this. Failure to carry out proper testing, sometimes ends with the predicament you find yourself in.
As you do not have the proper test equipment or sufficient experience, I would ask the 'electricians at work' to come and assist you, and rectify this problem.
