The pair arrived together and teased fans by flirting throughout the evening

The pair braved icy temperatures...

...as did hundreds of onlookers

The pair did their best to entertain fans

Bullock was wrapped up against the cold in black trousers and an embroidered velvet jacket

She plays a a neurotic environmental lawyer who is hired by Grant's billionaire tycoon

Bullock reluctantly allowed Grant to kiss her for photographers

The publicity is all good news for director Marc Lawrence

Big stars were thin on the ground - but actress Jane Horrocks and comedian Eddie Izzard did make it