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Comments
"If a gradient is too steep i.e. steeper than 1 in 40, the liquid may run faster than the solids in the sloping foul water pipe thus leaving the solids stranded, which could then block the pipe.
If the gradient is not steep enough, i.e. less than 1 in 110, then the pipe could still block if the solids slow down and become stranded."
pipe diameter divides by 2.5
so 100mm/2.5=40 so 1:40 gradient ( self cleaning gradient for intermittent or low flow rates)
see part H as mentioned for exact info.
For the 1:21 you may need a backdrop drain (google it).
Goggles backdrop - yep, can do that.
Oh and do not gravel to top of pipe and leave exposed if likely to rain. If the trench fills with water the pipe floats to the top and all the gravel along the sides ends up under the pipes. Had to re-lay 30M of pipe on my first build Grrrrr.