Electrics question

Defender 200TDI
Whilst helping out a mate, noticed today that the indicators are flashing twice as fast as normal. I know this normaly points to a blown bulb. Checked all the bulbs and they work correctly.
Now here's the weird one. When I operate the hazzard switch all is well. The indicators flash normal speed. I suspect the relay but I can't be sure.

"Is there a separate relay for the indicators and the hazzard lights?"

I've replaced the left hand relay but no joy.
One last thing. My mate has fitted LED Indicator bulbs to the front.

Any help would be greatly appreciated. A bit of a weird one

the problem is the led indicator bulb they usually require a load resistor in circuit or the flasher relay changing to a electronic type. as your flasher relies on the bulb load to work