Thanks for the responses as always, RBM and Laitch.
Sorry for my lack of clarity, Laitch. Yes, I did mean okay "to do" for an LED setup.
I disconnected (with no intention of reconnecting) heat grips and the windscreen, and since then, the indicators have doubled in speed.
I have just guessed that reducing the resistance would increase voltage to the indicators and hence the flash speed.
All globes are lighting up when switched on.
My end goal is to have the 2 new indicators (bulbs) flashing under 2 flashes per second (4 per second currently)
Kind regards
Dale