Can you help me to identify a mystery spider?

Observation - Can you help me to identify a mystery spider? - UK and Ireland. Description: Beside the Dyke on Dunwich Heath I saw a movement in the sand but couldn't see what had caused it, so pointed my camera set to macro and pressed the button. Had I known it to be a spider I may not have stood still long enough! I am fascinated by the heral

Beside the Dyke on Dunwich Heath I saw a movement in the sand but couldn't see what had caused it, so pointed my camera set to macro and pressed the button. Had I known it to be a spider I may not have stood still long enough! I am fascinated by the heraldic lion-face on it. Can you tell me what it is, please?