"Bert Coules" writes:

once you're breaking into the ring, it can be as easy to extend
the ring as to spur.

A good point, though this would involve using two junction boxes
rather than one.

If you're extending a 30A ring then the terminals only need to be
rated at 20A each (just as would be the case if you could fit all the
conductors in for your two spurs) and you can get six of them in one
box, e.g. URL:http://www.tlc-direct.co.uk/Products/AAJB206.html.

--
Mark