"Semper Paratus" Is Latin for "always ready" and there are any number of organisations have that as their motto. But , as it has a Lion and a Unicorn on it, that leads me to think it is English. Was it a Pewter Tankard? As you sign in from Hertfordshire, I fancy it has not travelled far from its original birthplace ,
If I had to guess, I'd say it was probably made in India. It looks like a confection based on a British army cap badge. It resembles the old General Service Corps but with 'Dieu et Mon Droit' replaced by 'Semper Paratus', which is not used by any British unit. The motto that should be on the garter appears to be missing and the arms in the centre are unheraldic and meaningless, as is the decoration around them. There should be a crown surmounted by a lion but instead there's a helm, which is also heraldically the wrong type and there's no crest.