Please help, WC waste connection - advice needed

Right, I took delivery of my suite today. I had previously emailed the manufacturer and asked if there was enough room behind pan to wall to get a 90 deg pan connector out and to one side (horizontally), they said yes.

After measuring I think not, sorry about the yellowness, it's my cameras indoor settings!!:

http://img260.imageshack.us/img260/3739/wc001uy1.jpg

As you can see there is 70mm from edge of pan to wall, level with waste connection, whereas a 90 deg pan connector is 100mm diameter before entering the 5" (?) soil connector.

Looks to me like the pan was designed for connector to go under floor:

http://img104.imageshack.us/img104/8480/wc002ts2.jpg

Can anyone advise on what to do here? It will be installed about 1-2ft away from soilpipe and wanted to connect horizontally, then box pipes in afterwards.

To me I can either:

a) chase into wall to allow pipe diameter

b) set pan away from wall slightly to allow connector

c) use a special connector for this purpose!!!!???

d) go under the floor?

My joists run at 90 degrees to the direction the waste pipe would need to go to meet soil.

What would a pro plumber do?

do you have an internal stack?

if the joist are running in your favour and if you can get the right angle on the pipe then under the floor probably would be best as the toilet is obviously deisgned for everything to be concealed and look neat

Yeah, I presume it's internal, runs from downstairs, through upstairs to roof.

Trouble is as I say, the joists runs the wrong way so I can't just run it down a void, and I imagine that notching into a joist enough to allow WC waste would weaken it too much?

When the cistern is fixed, is the clearance from the wall larger?

Rich

Change the toilet?

You've got two choices...

1. Build some studwork for the WC to sit against (if you have enough room). You can then use a straight pan connector.
2. As already suggested , change the WC.

I'm not changing the toilet, we like it, it's just something I'll have to deal with.

As for checking gap once cistern is fixed, it may get a bit bigger but not a lot, I'll get it roughly in place over weekend and double check.

It's looking like I'll have to stud out a little.