Got to give a shout out to Airfix's brilliant spares department.
I was building a Skyvan for the Anything But Military GB, but the masking fluid I used on the glazings didn't work properly, ruining the lot of them. Airfix not only had a replacement clear sprue for this model (last produced 12 years ago) in stock, but they sent it to me yesterday, BEFORE sending me an e-mail asking me for payment, and the part arrived this morning before I had a chance to ring them up and pay them. Total cost? £4 including that very fast postage.
Outstanding!