At 5.12 on the video there is a pal of mine called Barry Fentiman, a serious WRENN colector
He told me he almost hit James May when he reached for the W2408 Gold Plated 0-6-0 Tank
They were a non powered loco issued to commemorate the 50th anniversary of Hornby Dublo and only 140 were made
making it the second lowest production run of any of the Limited Edition locos.