Daresay a few of us saw this very large John & Yoko on Antiques Roadshow the other night.
I cannot get iPlayer over here but if anyone can upload the video even better.
Don't think you're likely to see a larger example - seems almost too large to be true but I guess it must be "right".
At least Hilary Kay didn't do the usual AR under-valuing thing - £35k-£40k might even be a bit full.
One thing that did bother me is that the item seems to be under sticky-back plastic. I presume that would have been mentioned though.
I noticed that. It looked as if the whole piece had been laminated. I think the estimate too was high.