Hello, Elle!
Today's setter has started a controversy!
I did not know Bolton was UK's biggest town.
Chambers has "a large town" under "city", so you best hang on to your shirt!
And I have mentioned before, betting is a mug's game!
I'd say the setter is OK with the clue?
Anne Bradford has "town" under "city" and vice versa, too.
Now, time for tea!