Please could you give me your opinion on the following:

I was given a fixed penalty speeding ticket last week by Cambridgeshire Constabulary for doing 93 on a dual carriageway (70).

On reading the ticket later, I noticed that the offence code written down is SP04 (not SP40). I could find no reference to this on DVLA website etc. On further investigation, I have discovered that this is a local code used in Cambridgeshire.

The DVLA have confirmed (by email) that this is not a nationally recognised code and cannot be entered on my licence as the DVLA computer will not recognise it.

It seems likely that the national code is SP30 and this is what will be entered on the DVLA computer. Surely the offence code on the ticket should be the code that is entered on my licence. If the offence code does not exist under the Road Traffic Offenders Act 1988, can I be prosecuted for it? Also, what code do I give to my insurer when I inform them of this?