Checked off and ready to stow in the front rack-bag: 2 x tubes, tyre boot, puncture kit, C02 cartridges and adaptor (only if it's raining!), allen key/minitool, mini-pliers, brake blocks, chain tool, 8 & 10mm spanners, grease, chain oil, silicone lube spray, cable ties, brake & gear cables, tape, various nuts, bolts, washers etc., plastic gloves.
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From Rob's handlebars