Hi Ian -
I did much the same thing thing for my husband who biked lots, was waaaay overdue for a new bike but thought it was unfair to spend that much money on himself. I really wanted him to do it tho, so in the end, I went to the bank, got the necessary money out in 100 dollar bills, and wrote him the most romantic note he's ever had from me which said, "Get a bike" (on a little yellow sticky note, no less). He got the message and we went off together to buy it a week or so later. I was so happy for him.
2010 Trek 7.5FX WSD - stock saddle (so far so good)
2002 Giant Cypress DX
In God I Trust