Broccoli & Stilton soup

Starter
British
Broccoli & Stilton soup
Rapeseed Oil2 tblsp
Onion1 finely chopped
Celery1
Leek1 sliced
Potatoes1 medium
Butter1 knob
Vegetable Stock1 litre hot
Broccoli1 Head chopped
Stilton Cheese140g