Not as far as I can make out. I think everything that's on the expanded Heyday is also on the BBC Box.
There are a few discrepancies in the dates between the two sets of sleeve notes. e.g. Heyday lists Reno, Nevada was recorded December 27th '68 and broadcast January 10th '69 while the BBC Box dates it to January 6th. None of these discrepancies are too far out for them to conceivably be different sessions (though I did get a little confused over differences in Fotheringay until I recalled there are two versions of this on the Box!)
I would've thought you would be enough of a completists to get it anyway, Gub! You would at least get a few pages of new waffle from Ashley in the sleeve.
Cheers
Nick
Thanks Nick. It
is quite an appealing collection in its own right.
I think my priority would have to be the Sandy Denny BBC set though as I seem to have missed that altogether.
I found some info on the Mainly Norfolk site that seems to support your view that everything on Heyday is indeed on the box.