Options to finish Brick Mullion window

[dans]

I have a very large brick Mullion window and am confused as to how to finish it. It was previously cement rendered, of which we've removed and have replaced the glass with small oak casements. I am in two minds as to either:
a) Re-point in a lime mortar and leave exposed
b) Lime render to match the majority of the house (some of the ground floor is red brick)
Has anyone seen a window like this on a Norfolk farmhouse before and if so, how would it generally (or traditionally) be finished, or what is the general consensus?

(the black parts are a breathable membrane which is about to be rendered!)

 

[Gareth Hughes]

Almost always rendered to look like stone - indeed most of the "stone" mullioned windows in Norfolk are rendered brick.

 

[dans]

Almost always rendered to look like stone - indeed most of the "stone" mullioned windows in Norfolk are rendered brick.

Thanks Gareth! Have you got any pictures by any chance?

 

[Gareth Hughes]

Not a brilliant example, but gives an idea:

 

[andrew gayton]

not to be confused with later examples in dust pressed terracotta which were not intended to be rendered or coated.

 

[dans]

Thank you Gareth! Much appreciated! Just given to my plasterers who tell me "No problem"! Will post pics when it's done!

 

[Gareth Hughes]

not to be confused with later examples in dust pressed terracotta which were not intended to be rendered or coated.

Such as these?: