[West Ender]

For mold to have formed so soon it is most likely the cheese wasn't stored properly, before sale, and has sweated at some point. It really depends on whether the taste and texture are affected. If they're not I would eat it, myself, I've had mold form on cheese I've kept a long while and I've just cut it off.

The mold won't harm you, think of blue cheeses, but if you take it back I'm sure Asda will replace it.