My advice is to just take it like a man and shop around for an insurance co that won't penalise you for your 1st 3 pts.
If it is a static point then you have little room for manouvre, if it was done by a real person then I would be able to give you some advice. The 'Bible's' that ppl talk about are worthless, they do NOT give any real advice, so it is not worth going down that route. As for Pip's suggestion that you say that your speedo cable broke, then that is not a valid defence as you have still commited the offence of speeding, also you would be committing perjury which is a lot worse then a simple speeding ticket .
Yes the ACPO (Association of Chief Police Officers) rules are that it is 10% of the limit so for a 30mph limit, 10% of that is 3mph, therefore the limit before getting a ticket would be 33mph, being caught at 34mph is im afraid just plain old bad luck