Posted: 06/11/2013 at 09:17
On the practical side - I'd get the crack checked out soon - it's probably due to the weight of the brick pier above it and might just mean those few bricks being chipped out and replaced. Not a big job - and not as big a job as it'll be if that pier sinks down a bit and compromises the structure at the top of the bay - you'll have water getting in then and that will be a problem.
Also, make sure that whatever you do doesn't block those air bricks.
(sorry, the ex was a builder )