connecting wc to cast iron collar

[rob_a]

Hi guys.
Installing a new pan which is being moved 90 cm to the right of the old toilet. Using a flexible soil pipe to 110 plastic pipe to run the waste back to the cast iron soil collar in the floor. The old toilet is connected with a 90 deg bend sand/cemented (eeek) into the cast iron collar (130 approx). Am I best re-cementing a plastic bend back in or is there a more convenient method to connect my horizontal run to the cast iron collar?
Cheers.

 

[ChrisR]

Cut the bell off the CI and use standard fittings
Avoid flexible connectors
Make sure you have a decent fall - I'd want at least 50mm for that 90cm.