Adding sockets to a ring circuit in the UK
Before you do any adding of sockets, you should check the size of the cable used for the ring main.
If it is 2.5mm^2 and still in good condition then extending the ring is not a problem, but don't just add spurs to the ring. It is  better to increase the ring loop to encompass the new sockets and, while you are at it, add more than you need ie be generous - it is very annoying to have to come back yet again...
Also check the breaker supplying the ring, if as you state the consumer unit has been recently changed then all should be fine.