For a couple of litres per hour, it won't matter for a while. Don't panic.
It could be a meter-pipework problem, in which case the supplier might deal with it (how long ago was the meter fitted?) - you might also reclaim the cost of the leaked water. If it's a pre- or about '60s house, it's probably a steel one, else plastic. If it's steel, it could be that fitting the meter contributed to hastening the inevitable leak, but there's no mileage in trying to claim against the water Co.
If it's plastic, locate the leak and put in a join.
If it's steel or lead (!), find a convenient route, and lay new MDPE pipe, make it 25mm, join in to your internal stopcock. Leave the old pipe there (unless digging out on the same route).
.... or get someone to. If you do some work, it will cheapen the job a lot. It might be an idea to get some prices from plumbers.
A thought - is the leak your side of the meter to your stopcock, or between your stopcock and the rest of the system? You might be able to narrow down the area.
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