As long as the circuit diagram does not serve an area larger than 100m2 then you can have as many sockets and outlets as you like on it. Make sure you are protecting the circuit diagram with the Project's system's correct size of breaker, normally 30A or 32A. The conductor should be a minimum of 2.5mm2 and the CPC (Earth) should be at least 1.5mm2.

A ring circuit diagram is also known as a ring final circuit diagram. It is sometimes incorrectly referred to as a ring main or ring mains (which are outdated terms) or simply a ring. It is a wiring technique that permits the use of wire with a diameter that is smaller than that of a radial circuit diagram with the same total current.

Entirely up to you. It is not the number of sockets that is important but the fuse capacity. You may need dozens of sockets for convenience, say in a laboratory, but not many will be used at any 1 time. Rings are normally and wired in 2.5mm cable and fused to 32 amps.

Unless a ring circuit diagram is wired correctly with spurs restricted to 1 double point per spur, there is an increased fire risk due to overheating of cables and power supply connections. If there are breaks in the conductors or loose connections in the terminals there are both fire and shock risks.

The ring has more current capacity than radial if the same wire is used because there are two paths to any load. It also has a lower loss. However, the disadvantage is that if an open circuit diagram occurs in the ring, you will probably not realize it but the remaining and active wiring will be carrying all the load.