Tannoy D700 - replacement woofer

Does anyone know the parts number for a replacement woofer for the Tannoy D700? A friend has a pair with a missing woofer - I assume it got sent for re-coning at some point and never came back...... I could take the remaining one out and measure to see if I could find an alternative pair, but it's definitely option two. Any info - or replacement suggestions - would be most welcome.

Be keen to get them working again - a quick internet scroll seems to rate them very well.
 
This D700 woofer has a label on the side of the magnet that carries numbers:

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