what did you do with your fazer today ?

[mr self destruct]

Uh oh that's proper arse twitching stuff mate....have you got an alarm immobiliser fitted???

I do, and it's played up a bit since I got the bike.  :\

Check your electrical connections. It is possible it is corrosion of connectors or a loose connections.

Procedure below does not require and major skills (not saying you don't have any major skills )

Start with the plug caps and work back
Unscrew the plug caps and cut about 10mm off the end and then screw them back in and put the boot back in position.
Lift the tank and take off the coil connection one by one and spray connectors with WD40( don,t spare it) and then put them back on.
As the tank is up open the electrical connections box. Take out each connector in turn pull them apart and treat both plug and socket to liberal doses of WD40.
Put all that back together
Now go the Right hand handlebar switch.
Unscrew the phillips screws and open the switch Spray the kill switch with WD40 operate it on off about 10 times and and spray some more WD40 into it.

The kill switch can be a source of problems if it has not been used for a while.
Now you have cleaned up nearly all the  connectors associated with engine running.

Last bit to do is under the left side panel.

Take off the side panel and pull off the biggest connect block from the starter cut out relay unit.
Spray the both  the plug and the relay connection with WD40.

Put it all back together and restart the bike. Hopefully it starts  :lol

No doubt someone will come back and say this is a waste of time, but believe me from my experience it is a worthwhile exercise.

Let us know how you get on.
You may find some corrosion which needs a little bit of rewiring, but that cane be easily sorted also

Cheers mate I'll give it a go tomorrow, but it'll mean taking the Mondeo to work.  :'(