LWB was the only designation for early long Transits, so has a solid history. I assume for later Transits we're getting combinations like 150L from plate/VIN info or sometimes glimpses of badges, so that is probably enough. But similar era Transits pop up without such clues, so where we can spot the length LWB should still be used. I'm not fussed if we just use the number+single letter format (we'll also have 150S and similar combos showing up), just as long as we capture the full information available in an adequate form. And it would be a pain in the proverbial for someone to back trawl our collection to remove superfluous "LWB"s while leaving the rest of the info intact. Maybe Sir Admin can concoct a precise algorithm to achieve this as a block update, but the freezer needs defrosting/the sock drawer needs sorted/the washing machine filter needs unclogging/that patch of wallpaper in the kitchen has started peeling away again, and the shed desperately needs another coat of creosote.