From the Library

[Biggles]

So now the bike is in Jack's shed. I'm taking a day off work tomorrow and I'll start the engine-out process. Meanwhile, I've got wheels. My mate Phil has a V50 Monza, but, because of a minor administrative matter, has allowed his licence to lapse until the heat cools off. Also his registration. Which meant there was an unused V50 in Phil's garage.
I was going to take my number plate and rego sticker off my V50 and put it on Phil's, but Jack said, "Oh, are you sure that's legal?" So I decided against it. I certainly wouldn't want to do anything of dubious legality. Instead, I put Phil's engine in my bike, also his frame and indicators and speedo and electrical cables and footpegs and gearbox and wheels and tyres and brakes and seat. And headlight and starter motor and swingarm.
The only thing, in fact, I left on my bike was the number plate and registration sticker. So now I'm riding around on my bike again, although with all those changes, it looks a lot like Phil's.
Once Upon A Distant Journey  Hendrik Gout  p57