afaik its pretty minimal,
Just a £30 fine no points
everyone thinks you are a *****
I don't really see why it's illegal not to have a front number plate when motorbikes don't have them.
I don't know why it would be considered illegal for me to make a third lane in non-moving traffic and me filtering down the middle in my car.
Oh, because it's a bike and not a car possibly?
Even if it's not going to cause you to get points but merely fined, in theory wouldn't it rather increase the chances of being stopped by the police and having to explain why you're not using a front numberplate anyway which would seem to me to be somewhat inconvenient?
Hang on a minute... so can bikes not get done by those backwards facing (i.e. they take a photo of the front of the car) speed-cameras? I've only just thought about that.
"Oh dear officer, I had no idea! It was there when I set off!"
or
"I know officer, I'm very sorry. It fell of earlier and I've picked it up *shows plate* I'm on my way to my garage to get it put back on, unless you have anything I could use to re-attach it?"
Wish we had a rear plate only which was made out of pressed metal and of a slightly smaller size, still trying to decide if a plate issued once you pass which you keep for life is a good idea or not.