You don't even need the GB and European Union logo (ring of stars), but some have it anyway. Some people have the Cross of St George and England written underneath, some people have the cross of St Andrew with SCO underneath, but it varies.
Lacey's is the most correct, although his is the style introduced in September 2001.
Older British plates up until then were a letter followed by 2-3 numbers and three other letters e.g. R212 DTS
(not mine, I made it up on the spot). The initial letter denotes the age period (I think R was September '97 - March '98) and if there's an S in the last three letters, it usually means it was registered in Scotland.
The new style (Lacey's) is this: the first two letters denote where the car was registered, which isn't always obvious - you can get a list of them. There's a number 0x which switches to 5x every six months. So, in September 2001, we had 51, which switched to 02 in March 02, which switched to 52 in September 02, and so on. We're on 56, switching to 07 on March 1st this year.
Or... can you tell I might be a little bored right now?