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Chris has the 60D, I looked into getting a Nissin Di866 and had it confirmed this would work fine with the speedlite flash control on my 7D which I believe is the same system the 60D uses.

ChriP with regards to using the pop up flash to control the off camera flash it is possible to switch the pop up flash off so it emits a tiny flash which has no flash effect on the image in fact I left it on and wondered why my pictures were way underexposed DOH!

TBH I have not ever heard or read a good review about the Jessops flash guns so I would personally avoid them and look else where such as NIssin or save a bit longer for a Canon unit.

I would suggest you get a unit that supports swiveling as well as tilting otherwise you may find you wanting to buy a new flash gun too soon, I have had my 580EX Mk 2 for 3 years now and I love it, I did get it for £200 brand new which was a total bargain. I think what I am trying to say is buying a flash gun is a bit like a tripod once you have got a good unit you shouldn't need to change it until it breaks and should serve you well for a very long time.