Not sure how you tell if it from this year's young, in very nice condition
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It is definitely a female, with a very narrow stripe down the breast. You age them very much like a Blue Tit, basically, by looking at the colour of the wing coverts...blue in adults, olivey-grey in young birds. It's often more difficult in Great Tits, though, and difficult to be sure, from these pictures.
My Flickr photos...
Thank's ophrys I will try and get some better shot's,there are rather a lot and I was not sure how you sexed them so will look at the stripe on the breast in future.
Lat/Lng: 55.0572, -2.2343
OS grid ref: NY851736