Well I'm using Memory Map, so it's based on OS information. The same software gave about 1300 m or so for last year's course which is roughly the same as my Garmin gave! The interactive map from last year gave the total climbing as 1232 m!
I'll let you make up your own minds if you think it's right or wrong. But personally I don't think it'll be a tough course, then again I train on the edge of the peak district so I get to play on real hills!

Edited cos I can't spell & to say I'll try & remember to upload my garmin information from last year to COnnect & you can compare information!
Edited: 05/03/2012 at 13:17