I understand that the Archbishop is calling for St George's day to be a national holiday - like we really need another day off in April!

A better idea would be a bank holiday in October or November, such as:

21 October - Battle of Trafalgar
We could sing 'Britannia rule the waves. Britons never, never, never shall be slaves!'
And we could wave flags.

or:

25 October - Agincourt / St Crispin's day
We could have archery displays.
And we could wave two fingers at our enemies.

or:

Early in November we could celebrate the historic thwarting of a terrorist plot - what could be more suitable in the present world? We could call it the 'Autumn Bank Holiday'.
We could have - let's see now - how about fireworks displays?
And we could wave sparklers.