Doctor T wrote:
I do know of one person that was stopped by the police for having an HID bulb in his bike. He was given 6 days to fix plus proof from an MOT center to check he had changed the bulb back to standard. Plus 6 points.
The person you know is feeding you BS.
The scenario you are referring to is being issued with a 'Vehicle Defect Rectification Notice'. These are issued by the police for minor vehicle defects, they are not issued in conjunction with a Fixed Penalty Notice unless the driver / rider has (at the time of being stopped) also committed a traffic offence - speeding for example.
The time limit for rectifying the defect after being issued with a Rectification Notice is 14 days, not 6. The proof required is a receipt from the garage or mechanic where the defect was rectified. It does not have to be from a MOT test centre.
From the gov.uk website...
Being stopped by the police while driving : faults with your vehicle
If your vehicle has something wrong with it, for example a broken brake light, the police may give you a 'Vehicle Defect Rectification Notice'.
You’ll need to get your vehicle fixed and provide proof that it’s been fixed, for example a receipt for the work from a mechanic. You have 14 days from the date of the notice to show the proof to the police.