Juvenile rat or wood mouse

Much searching on the internet has left me undecided. There are 2 of these in the garden (that I can see!) never seen them before. They appear to be eating the grass seed and an occasional worm. About an inch and a half long. Juvenile rats? Or something less horrifying?
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Defintely not a rat.
Sorry Buttercup , good luck.
Our mice are usually the little golden brown wood mice, I think the babies are dark like yours until they grow up.
https://www.woodlandtrust.org.uk/blog/2017/07/types-of-uk-mice/
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog