Bathroom waste

[SuffolkLad2017]

hi Iam after some advise see below picture,

Iam currently Switching my bathroom and kitchen around, in the new bathroom location I have a 4inch stack (where my kitchen sink used to be) so I am getting the plumber to connect the toilet to this,

My main question is for the bath waste.
I want to channel out the concreate floor (it's a ground floor bathroom)
And run a pipe from the bath waste to the 4" stack. can this be done in 2inch waste pipe? Or must in be done in 4" brown? What traps should be used etc

Also what Depth should the pipe be?

Many thanks

 

[just pumps]

You are seriously out of your depth Lad let the plumber do it.

 

[Hot&Cold]

You are seriously out of your depth Lad let the plumber do it.

Best advice and consider the alterations may require some building regulation sign off

 

[SuffolkLad2017]

I wanted to get The trench dug ready ,
And I have had to plumbers over both saying the others way was wrong,

so came on here for some advise as I thought that is what this site was for,
Sorry if I was wrong about that

 

[just pumps]

I wanted to get The trench dug ready ,
And I have had to plumbers over both saying the others way was wrong,

so came on here for some advise as I thought that is what this site was for,
Sorry if I was wrong about that

Past post said you were working with friends from various trades so what do you need us here for, anyway leaving that aside and ignoring you throwing the dummy out of the pram. McAlpine make wastes and connectors for just about everything so look at their website and see if they have a connector for 4" Brown to a bath.