A Souvenir of London

Bought a souvenir in London
Got to hide it from my mom
Can't declare it at the Customs
But I'll have to take it home

Tried to keep it confidential
But the news is leaking out
Got a souvenir in London
There's a lot of it about

Yes, I found a bit of London
I'd like to lose it quick
Got to show it to my doctor
'Cause it isn't going to shrink

Want to keep it confidential
But the truth is leaking out
Got a souvenir in London
There's a lot of it about

Will I finish with that one?