I was going to suggest the Cobra 'peanut butter' spanner from Hubjub, but he only has 14 mm ones in stock at the moment.
Local tool shop and buy a 15mm spanner, I've got a very nice one with a ratchet from halfords for about £10
@Sainsburys_Ed started
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Local tool shop and buy a 15mm spanner, I've got a very nice one with a ratchet from halfords for about £10