I've just got off the phone with an actual, real life, certified (or maybe certifiable!) MOT tester, and he says you MUST have a horn and a rear brake light!
Anything else fitted must work! So, if you have an indicator switch on the handlebars, then indicators must be fitted and working. No switch, no indicators - that's fine.
Race pipes are OK, so long as (at the testers discretion) they aren't too loud, but it's more likely to be the airbox/carbs that are louder! No more BSAU196 or whatever it was.
Oh, and road-legal treaded tyres.
MOT it on the frame number, send the MOT off to DVLA, and they'll issue a V5. A certificate of date of manufacture with the MOT certificate will probably get you an age-related registration number instead of a "Q" plate.
There you go! Always willing to research the facts for the cause!

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Andy.
NSR-WORLD.COM
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