How to extend a ring circuit

[henry1]

I've got a single socket which I'd like to replace with 3 double sockets.
How can I connect the new cables to the old to extend the ring circuit?
I've read that using a junction box is considered as a spur, so I'd only be able to have a single double socket.
What about using 30A choc blocks? I could use the current single back box as an access point and cover it with a blank plate?

Completely separate question, I found a socket feeding an electric oven being connected as a spur - is that fine?

 

[EFLImpudence]

I've got a single socket which I'd like to replace with 3 double sockets.

Ok.

How can I connect the new cables to the old to extend the ring circuit?

With any accepted suitable connectors.

I've read that using a junction box is considered as a spur,

A spur is a spur however and wherever it is connected.

so I'd only be able to have a single double socket.

If you use 4mm² cable for the spur, you can have as many sockets as you wish.

What about using 30A choc blocks?

Fine.

I could use the current single back box as an access point and cover it with a blank plate?

You could also retain the socket and do the same.

Completely separate question, I found a socket feeding an electric oven being connected as a spur - is that fine?

Yes, assuming everything is done properly.

 

[thomp1983]

Prepare the mounting of the 3 sockets, fit 1 wire from the existing socket and a new piece of cable to socket one, fit the unused end of new cable and a second piece of new cable in second socket, unused end of second new cable and the spare cable from the original socket wiring fit in the third socket.

Depending on the wire lengths you may need to run the spare cable from the original socket into a suitable junction box and then a new cable from there to the final socket.