Downstairs Bathroom - Sewage smell

Hello,

We have had a bad sewage smell coming from the downstairs toilet for the last few years. We had a new suite put in back in 2019 which didn't resolve the issue. The smell seems to be coming from the sink side of the room. I have removed the sink unit now and can see that the waste pipe just seems to fit in a hole in the ground. The pipe in the ground also seems to be damaged. Is this likely to be the cause of the issue (potential stagnant water not draining properly into the main drain)?

Thanks in advance

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