Freelance / Contract / Conultancy rates?

I’m in the process of setting myself up as a Maya TD/Pipeline consultant, leaving my current employ and going it alone. I’ve got over 20years experience in the industry, both Post Production and Games, and am currently working as a Department Head, designing complex Maya Pipelines. Sorry can’t say any more at the moment.

I’m trying to put a business plan together and was wondering what a far daily rate would be? I’ve been offered a possible contract with one of the major London Post houses but really wouldn’t know what I could get away with charging as a daily rate, £250, £350, £450 ?

Also do any games companies out there use consultants to advice, train or design bespoke tools and setups, or is everything always in-house?

All advice is welcomed

thanks