Yes, a home demo is better than just a shop demo.
Trouble is, what's missing is a selection of other speakers he could buy for £1000.
All he'll have to compare them against is his Tannoy DC6T's.
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I tried the following speakers within the 1000 (and slighlty higher) range previously...
B&W 683, zensor 7, MA silver 7, Mission SX3 etc. Its not like they are not good. Except for Zensor 7, they all sounded better than my DC6T. It's just the R500 sounded a whole lot better for which I considered spending the money.
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If you think the R300s are that much better then I would take the deal, seems like a good one. Presume you still have the full warranty, maybe worth checking the history of them before paying.