The fatbob has stalked on me twice in the last few weeks only while changing down at slow speed. Got it booked in tomorrow to get it checked out. They did ask me if the speedo and indicators were working ok also?

What year model mate, and does it run a tuner?

 2012 mate  stock standard. 

IAC motor might need a clean or replacement, other one that I have had happen is a broken wire on the MAP sensor.
But the second will throw a code, so that's iffy.

last one might be a faulty relay, been a bit of that goin on lately.

Hmm it may well be as simple as an air leak. Too much air will put it out like a light!! Happened to me when I swapped air kits. It ran hard and loud, but pull up and it would stall.

 Yep. Will find out tomoro arv or thur arv. Will let you knowthe result

My 2012 has been playing up with surging and cutting out.

It is booked in tomorrow for the 4th time but this time for a new wiring harness!

I will let you know how it goes.

 Snuffed out on me twice this morning just getting to the bike shop !

 Picked bike up. Didnt stall once at the shop. No faults. But was alot of play in throttle!  Adjusted. Alot better!

 i put shell petrol in my bike & it stalls out after been on the express way, i don't like shell , i think BP  98 is the best

 Yeah always try and get my fuel from the same servo. Cant be helped when travelling sometimes. Cant believe the difference it made adjusting the throttle.  Alot better!