The flexible braided hose with the filling valves drips a bit when I use it. If it was more accesible and didn't need me to empty the cupboard of my wife's stuff I would remove it and check what is happening.
Are there some standard o rings that I should arm myself with when I remove it to investigate? It had thumb screw type nuts on each end.
Since it is *only when you use it* presumably the connections to the water mains and the boiler are OK, which suggests a leak from the spindle of the valve. This in turn means it is *probably* not worth trying to repair, I would be inclined to try to get a replacement hose. ISTR they are supposed to include a double check valve.
POSSIBLE CORRECTION TO THE ABOVE, are you saying that it looks like this?
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I've never had one like that, but this seems to have stop valves at each end, which means that a leak between the valves and the flexible hose is a possibility. Those "thumb screw" nuts might have O rings, but IME are more likely to have normal flat washers, either rubber or fibre.
If you do a lot of DIY it's worth getting one of these
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and one of these
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(not necessarily from Screwfix, just used them as a convenient example).
They tend to use flat rubber washers. For O rings to work as designed they need constraint which means a more complex fitting. Washers need to fit neatly in a 1/2BSP screwed fitting.
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