Its maybe a sign that collectors have more money to spend.
The item was unique and £2000 might not be “ludicrous”, as it will only become more valuable with time (im not talking about an investment, but simply that it certainly won’t suddenly decrease).
Compared with the P-51 “project” (a few instruments and parts of the hood) resently offered for £5000 (not sold), and a few other items with ludicrous starting prices, this item found its “natural” value by bidding and not by having a crazy starting price.
£2000 would get you a lot of other nice parts, maybe even a good cockpit, but having a Halifax throttle box would be worth two non-Halifax cockpits to the serious Halifax collector.
Fair deal for both buyer and seller. Hope it gets on public display.