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It all makes sense now, yes it is a gully. You learn something new every day. Thanks for the help

Thanks for the reply, I don't understand all your question, but will answer best I can! Its not a soil pipe. The existing sink waste pipe goes straight into the concrete floor and must join a gully underground, this gully has a hopper on the outside of the property, as you can see water...

I'm relocating my kitchen sink, the nearest foul water drain will be nearly 6m away. I know I can't go that far with a 40mm waste pipe, but does anyone know if building regs will permit a 50mm pipe at this length (or part 50mm / part 40mm)? Any answers/ suggestions would be much appreciated.