Has anyone asked TFL for the use of their roundell design?
I think you'll find you'll be in breach of copyright.
Nevertherless a good idea using a familiar logo unique to the capital.
At this present time it would probably go down well with our northern brothers, given the actions of the RMT at the moment.

Boris is a non committed Quins Rl fan

Nah.

People play on this kind of signage all the time, and often for commercial benefit too.

1980-2010. looks like we've died. Could be prophetic. How about "30 Years of London RL"

Let's be optimistic - 'The First 30 years of London RL!'

except it wasnt

OK then, seeing as its for 1980-2010 I'll amend it to '30 years of London RL'.

I much prefer "Est. MCMLXXX"