I have spent a rather ridiculous amount of money, on stuff I didn't really need. Or perhaps I do need it.
In any event, I felt I had to.
On my Sequoia, due to a busted 105 shifter, it's got a temporary Sora shifter, but it looks daft, and so really needs a replacement 105 item. On the Planet X, I've been thinking for some time about getting the new 7900 Dura Ace shifters which are lovely bits of carbon lightness with added titanium bits and has the added advantage of no dangly cables reflecting the Hope lights into my eyes at night (which in fact is very annoying).
So........... I've bought the 7900 set to go on the Planet X, and I can then move the old shifters from that, onto the Sequoia. So I don't feel quite as bad as I should do, as I can quite legitimately justify it, as otherwise I'd have to buy a single 105 shifter and I'd still be left with the reflecting problem.
Technical experts might well point out at this point that I'd need to get a new front dérailleur as well, as the 7900 shifters are only compatible with the 7900 front dérailleur. And you're right, I've bought one of those. However, by an amazing coincidence, my current one had cracked due to over enthusiastic shifting. So that purchase is a necessary one as well.
So really, it was all necessary, and to cap it all, I will have vastly contributed to the continued growth of the UK economy.