I get through dozens of 30A (or 32A) single-pole breakers as they're very common in Britain. [Linked Image]

The big stores are handy for when a regular supplier runs out of something and the job needs to be done in a hurry. My regular wholesaler seems to run out of a certain size cable quite regularly at the moment, so the B&Q store (similar to HD, even down to the orange color scheme) just up the road sometimes comes to the rescue.