Need to make good around 110mm soil pipe

[rubble2]

Hi, I need to make good around the 110mm soil pipe exiting our bathroom wall. It was just filled with mortar previously but as you can see, there is quite a deep/wide void to fill so would it be acceptable (or a complete bodge) to pack out the void with some expanding foam etc. before finishing off with mortar as before?

Any alternative options welcome. Thanks

 

[Alastairreid]

Fill it with expanding foam then fit a pipe collar for a neat finish.

 

[RandomGrinch]

fit a pipe collar for a neat finish.

I was going to suggest that, but I don't think the collar will sit nicely around the sweep of the socket branch in this case

 

[noseall]

Foam - cut back - point.

We are big fans of removing the masonry and re-building the bricks back - rather than coring.