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If you hit mortar because you didn't have enough choices about how things line up then you would need to find maybe 8 special plugs in the bottom of your box and start to work out what will hold in the mortar. I use Fischer plugs that have wings to stop them spinning in mortar and I've not had to worry to much since having them. Sometimes you need to go up a couple of sizes which can be inconvenient if you've no choice about the screw sizes. In that case you can gently pack the larger size plug with a smaller plug or matchsticks/split dowels. If that fails you can make a wooden dowel, fat and conical and drive that into the hole creating plenty of pressure around it. A big one of those can hold a cast iron radiator with a painter balanced on it.
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Airhead
@rhb
So, cut shelves worked thanks @si_mon628 & @Bobbo for advice and @atk for having circular saw on standby just incase.
Back to top shelf we're agreed we'd rather it went into brick not mortar, even though it means it will not be evenly spaced. Trouble is I've drilled 9 holes across 2 horizontal lines now and only jut brick once. Am I just very unlucky or is there a method tradespeople use to be certain to hit brick not mortar? Google suggests it is luck but that seems odd nowadays.