clay pipe size help required please

[homer_simpson]

i`m putting down some driveway drainage but i`m not sure what size the clay pipe is, i`ve enclosed a pic and in the pick is some pvc pipe 110mm.
as you can see i`m restricted and cant use a trap. i was hoping to use a strap boss but that does`nt look feasable or maybe a clay saddle but its lookin like i`m gonna have to cut the pipe any help would be very much appreciated

 

[chrishutt]

Looks like a 4" pipe. Next size up would be 6", nothing smaller than 4".

 

[Nige F]

If the pipe is a rainwater one.....then you can pretty much join it into the drive drain as you like .because you`re dealing with stormwater , not sewage........unless of course it`s a combined system, then treat as sewage pipe

 

[homer_simpson]

all done now managed to fit a saddle on it only just tho thanks for the replies fella`s appreciated