You may not have the skills or knowledge to be in a position to use these BUT if you have them someone on site may be able to help you out.
It may seem a lot but a kit of around £30 can fix a lot of minor problems.
You can also carry a few things to help yourself:
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A Screw Driver Set (the type with a handle and a set of different tips) - under £2
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Pliers - (£1)
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Set of 12v Fuses - (£1)
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Insulation Tape - (3 rolls £1)
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2 x 6” Adjustable Spanners - (£3 each)
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Roll of Mastic - (£10 the most expensive item)
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Roll of Gorilla Tape - (3.99)
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A Multi Meter - (under £5)