Hat, gloves, water bottle, provisions (good dark chocolate, or whatever else...), whistle.
If you have indoor accommodation, I'm not sure I'd bother with waterproof trousers (I don't own any). It would depend on the weather forecast. Down south (i.e. anywhere south of the M4

), it is very rarely wet *and* cold. If there's a risk of being cold (e.g. overnight hiking), I'd bring fleece-lined trousers.. If it's going to be wet and warm, the lightest quickest-drying trousers I can find (or possibly shorts).
Some kids have waterproof trousers that to me seem ridiculous in the amount of weight they add for a relatively low benefit.
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