Edwardian drain overflow

[paulharvey]

Hi all.
We moved into an old Edwardian home 5 years ago. Solid brick built house and still retains some original features.
Not sure how old thi box is but a few times has definitely caught some overflow as the drain tends to become regularly blocked. I'm told by the drain expert that its due to the number of bends. Its built from engineering bricks.
My question is what I can do as it is an eyevsore! Should I fix it up? In which case what kind of mortar should I use?

Any advice will be much appreciated!

Thanks

 

[Scally-Ho]

If it was my problem, I'd remove the existing open top gully and replace it with a back inlet job and then reroute all of the discharges into the back inlet and then finish the new gully off with a much smaller and neater kerb.