5A Round Pin Socket Wiring and Fusing
There's no such thing as a lighting ring in UK domestic wiring. Lighting circuits are radial. (They run out from the fuse box but don't return to it.) If you are taking power from one of these you don't need additional fuses - the fusebox already provides the needed protection (5 A fuse, 6 A MCB). If you are taking the supply from a 30/32 A ring circuit you'll need a fused spur unit fitted with a 5 A fuse. (You are likely to need to buy this with a 13 A fuse and replace it.)
You can use either option to wire the sockets. Note with option 1 you'll need to use a sufficiently large ceiling rose cover to accommodate all the connections (or run them from the switch on a suitably deep backbox). Wago connectors can be useful for hooking everything up. Apparently 2 A plug/sockets are OK to use on a lighting circuit but the larger 5 A ones are easier to wire up.