Last time this came up, I found a link somewhere that said that the bike needed a working horn.
Colin, not an mot tester
yep that what i got told , i used to ride my k1 with race bodywork on the road for just over a year. i acctuly got a reply from mcn lawyers stating what was and more importanly what isnt.
main thing being if you have a working rear brake light then in the eyes of the law all others must be fitted and workin, you can still have them fitted but must cover them up so other road users dont get confused when you brake.
working speedo is also a must as along with hooter, push bike(clown) honk honk horns will not pass fit. if bike is not yet 3 yrs old then no day time mot is needed, but other thing to consider is insurance company will more than likely load you (mine did 15%)and if the weather sunny when you go out if it turns wett and a lot of rain = poor visabilaty, therefore can get a tug so you have to sit and wait happens a lot believe me

couldnt be botherd to take on off road/race fairings so just use on trackdays now ahh yes mirriors not needed but i found that was a complete pain as i spent more time looking backwards not just for coppers but to check mates were still there

ps the busest place i went on it was brands wsb last year went past many many police even parked up in side entrance oppisite there mobile office not one batted an eye lid though i did put the road can back on and a full size reg plate