Soil tube-like traces on mountain grassland, up to 1m long, left when deep snow melted?
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Can't be anything else. Can it?
very common in Russia after snowmelt, assumed to be small mammal runs under the snow.
These are wonderful, as Mike says can be seen in Arctic countries but extremely unusual in this country. They are thought to be caused by animals forced to the surface by perma-frost, the deeper soil freezing so the animals have to create very shallow burrow systems.
In this country probably caused by moles. You say they were a metre long, how wide were they? This could indicate how large the animal was that created them.
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Lat/Lng: 54.2, -2.4
OS grid ref: SD7984