Anyone know what this is?

Anyone know what this is?

Observation - Anyone know what this is?. Description: There were 3 or 4 of these plants where cattle were grazing in grassland between patches of woodland in the newforest. Thorns and leaves like a rose or bramble but a very different flower - pink mossy cotton wool type appearance. Or is this the seed head

There were 3 or 4 of these plants where cattle were grazing in grassland between patches of woodland in the newforest. Thorns and leaves like a rose or bramble but a very different flower - pink mossy cotton wool type appearance. Or is this the seed head maybe? Any ideas? I love plants but am strictly amateur so this might be obvious to some of you. The plants were around 8-12 inches high when we saw them.