How do I fill gap ?

Hiya all, another question for all the forumites.

I have recently installed a new gas heater in our PPOR. It is awesome ! Only thing bugging me is how installer left the outside brick work :(

I really need some ideas on how to fill gap around flu.

All ideas welcome ... I have attached pic as way too difficult to attempt to describe.
 

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squeeze some morter in it and brush off with a dust brush b4 it goes off about 1 hour,

BUT if you paid the guy for the full job he/she should comply and finnish the full job.
 
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