How do you avoid photo-ops being at 6s and 7s?

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How do you avoid photo-ops being at 6s and 7s? Who and what is the OBR? How much is your signed stuff worth? Who will become the Member of Matt's Parliament for Swansea West? Matt Chorley brings you the who, what, where, why and when of British politics. If you've got urgent questions... then email Chorley@bbc.co.uk