If you're vegetarian don't be put off by the Worcestershire Sauce in this recipe. The original Worcestershire Sauce does contain anchovies, but there are numerous brands these days offering up a vegan alternative (Biona, Annie's Naturals...). Or you could make your own - try this enticing recipe
from the Viet Vegan.
These potatoes can be frozen. Let cool completely, then wrap each half individually in foil (minus the scattering of cheese). Label and freeze until required. Preheat your oven to 220C/ 425F/ GM7. Unwrap the potatoes , place on a baking sheet, cover with foil and bake for 40 minutes. Remove the foil, scatter with cheese and bake for a further 20 minutes. Alternatively, defrost completely, scatter with cheese and bake for 25-30 minutes at 200C/ 400F/ GM6