Drainage solutions

[1311]

Hi,
I would like to lay a patio in my back garden-around 17 square metres.
The drainage for our current patio is very poor.
I would like the patio to slope away from the house-enter a gully type drain.

It's from this point forward I am unsure what to do. What options do I have to install a drainage system. I was told a soak away might work but I do live in a clay area. However one part of the garden next to a reasonably large tree the soil is very good.

Can anyone please suggest any ideas for possible drainage solutions?

(There is no existing drainage I can put it in to. Unsure where the pipework for the down pipe goes)

Thanks

 

[freddiemercurystwin]

You cannot lawfully drain into the mains.

 

[Robbox]

if the rainwater already drains into the sewage lines, and changes are made, does this mean the changes have to be routed elsewhere?