The question I'm about to ask is very similer to others for verticle waste not horizontal and the answers don't seem to fit what I have so apologies if I'm repeating something?

My toilet backs on to an outside wall and connects to the 4 inch upvc waste with a standard straight connector goes through the wall then 90 then short sloping run to the main stack all very simple so far. I want to turn the toilet 90 degrees which will then back onto a internal solid wall. I thought I could use a standard wc 90 elbow back to the exsisting join but the problem is the toilet with the elbow will be to far in to the corner and if I pull the wc forward there will be a gap between the wc and the internal wall. It's a p type trap close coupled toilet.

When other work in the bathroom is completed I wish to change to a back to wall type with new units behind, if these are not deep enough I will have the same problem with the new wc.
I suppose an easy fix would be to move the inlet through the wall back a bit but that's seems like a lot of work just for a few inchs or can I use 45,90 elbows or flexi pipe to do this. I suppose the shape will be like a ? Looking down on it.
Can I also connect my sink waste to this as I have seen an elbow in b&q with a 32mm inlet on the bend as the sink is going next to the wc on the internal wall? Thanks for any help in advance.

You wish to install a dog leg to bring the toilet closer to the wall? Why not use a 90 and fur the wall out?
Also you may connect the 1 1/4" drain from the lavatory providing the lavatory's vented. Good luck, Tom

Thanks for the help I ended up moving the waste along the wall a few inches and used an elbow with a 32mm take off for the sink works great. Only down side was making another hole in the wall and refinishing inside and finding some bricks to match a 50 year old house on the outside, got a close match from local building yard this was more work then the actual plumbing so now all is finished and the wife's happy ha ha.

Congratulations on a job well done. Tom