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Thanks, think I will go for extending if possible then. Don't think I was clear in my description... I wasn't suggesting a string of spurs all off the same point, it would have been several spurs so the cable would drop straight down to each socket. But still I think extending makes more sense like you say. I will have to get back up in my horrible loft and see what I can find, there's cables everywhere!
Arducius-
No problem. It's very rarely clear from the text description in the case of electrical installation! You asked for downsides and really the future potential to create a spur if you extend the ring is the only advantage I could think of. Good luck in the loft, these jobs are very often much worse in the planning and get worse the more you think about them.
Airhead
You can only spur once. If you extend the ring you can then spur from that later if you want.
It's preferred that you make connections in existing backboxes rather than just splicing into the ring under floors or in the loft etc. It's just a question of convenience in the future if someone is working on the circuit or fault finding. You have to balance that with convenience now of course!