Identical complete shower waste required

[colinsmith44]

I have a shower waste problem which I am hoping you can help me with? It was fitted five years ago and I don't think it has ever been right. Soil pipe smells are coming up through the shower waste. I do not think that all the parts on the waste are correct. I have taken a photo with the top off and the basket removed, do you think you would be able to identify the model from photos of the fitted bottom part so I can buy the whole part and use the correct upper items?
Hoping for an answer, thanks. Max diameter is approx 110mm
Regards
Colin Smith

 

[snowhead]

Possibly Mcalpine ST90CP10-70 if the top looks like the screenshot