So I've finished trying to take street candids in Oxford, and I'm on my way back to the car park.

Then I see this lady shopper posing awkwardly for a passer-by who is taking her photograph.

'So why have you gone green?', he asks. 'It's for a bet', she says as if it was obvious.

I run ahead of her and no more needs to be said, she is quite happy and now more comfortable to have her picture taken again.

We head in the same direction, except she goes into a cafe and orders a coffee! - is she so non-plussed? - or maybe it is part of the bet? What else will she have to do win the wager?

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