Just found out about this site where you can get the details of your licence regarding pass dates,catagories,any penalties etc. Useful if you're changing details and it comes back with Cat A missing. All you need is your driving licence No, NI No. and post code on licence ,takes a matter of minutes and could save a lot of hassle. Just printed mine off and filed with photocopy of paper and card. May be old news but it was new to me.
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