I'd expect to get away with it - if you get a nasty surprise in the post it'll be for a 60 quid/3 points effort which shouldn't affect your insurance premium, assuming your licence isn't loaded with points which it doesn't sound like it is!
Most insurance companies are fairly easy going on SP30s so long as you've got no more than 2 on your licence at once.
They may offer you a driver improvement course, but you have to take it near where the 'offence' took place so may not be all that convenient if it's nowhere near home.
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