I've just got up and found that Earl is covered in round lumps (the diameter of a 5p, but very raised).  They're concentrated on his lower legs, muzzle, ears and tail, but are also dotted around his torso and back.  They're itching as the poor lad is nibbling at as many of them as possible, but otherwise he seems OK in himself.

I'm waiting for the vets to open so I can get him in today, but anyone got any idea what this may be?

He went for his usual walk yesterday, certainly didn't stick his head into anything or walk through anything unusual.  He had his normal dried food, ate some veggies in the evening (those that our 2yo left so a tiny amount of carrot, brocoli, sweet potatoe, potatoe and peas).

Thanks in advance,
Helen

My first bitch had a reaction like that after being given penicillin - it sounds as though Earl's come into contact with something that he's allergic to. I do hope you find out what it is.