I made up a heavy steel plate that is bolted to the flange. This is threaded to accept my enormous Sykes Hydraulic puller (cost about £300 and comes in a steel box - it weighs about 20 Kilos ).
I do it up until the plate starts to bend, then give the plate a sharp radial dunt with a hammer. That usually springs it free .
I followed JWinn's advice last year and found their tool hire facility to be very good, it was a delight to have all the proper tools for the job. IIRC after paying a £25 deposit the loan was free apart from the postage. They also provided very good technical advice.