sounds like youve got sports light bulbs they accelerate quicker than std light bulbs yes im joking :rotfl: check you havent got a bulb out somewhere.
LOL!!! thats good, please who told you that? the bulb opposite to the one flashing has probably blown, or the relay has come lose and or you need a new one
Either that or are they the standard indicators? If aftermarket like LED they need a resistor in the line.
If thet've been swapped for aftermarket indicators then the wattage /load on the relay will be wrong causing them to flash too fast. As said, you need an in-line resistore or a dedicated relay either way, is a MOT failure coz they flash too fast :rules:
a dont no a didnt have it at that time a only got it a week ago and it got an MOT a month ago cratch: