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@Vince
Hi all,
The wheels are still available - I had a couple of queries about clearance gains so here is additional information.
Here is what a 700c wheel looks like in the back of the dropouts:
So the 650B/27.5 rim sits back around 2cm (when the wheel axle is sat as far in the dropouts as possible) in comparison to the 700c, giving you extra space radially for a wider/fatter tyres.
You also gain around 1cm in lateral width as the rim effectively sits further back along the drive stays.
Those measurements have been taken on my Bridgestone Anchor which has supertight clearances so I would imagine that my measurements are a worst case scenario and that your bike will have even more space for wider tyres.