I nearly did the same on mine, came off a road and it was a 40mph from a 60mph road, sat at 30mph then remembered that it was 40mph and quickly brought it up to speed until I turned off very soon after. There probably was a sign when the limit changed but you're not looking for that normally are you...i.e. you want to concentrate on slowing down first IMO.
Hitting the kerb is a "serious" because you're not allowed to make contact/mount it at all.
It's stupid, i mean, who on here hasn't tapped the kerb on a parellel park (well, i have, it can't be only me!) If the rest of your driving was good, i.e max 2 minors, I reckon they should have discretion really.
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Uno 1.0ie Start. Standard.
I am a schizophrenic currently so please bear with me whilst I try to get rid of the 40+ personality.