Oh, yes, the Lledo Days Gone range... I wasn't collecting when these came out, but I read that collectors critized Lledo even back then, that the mass of models released was simply too big.
Just one look at eBay (especially the UK-version) now, and also the previous comments here tells it all. There ARE indeed far too many models on the market. Ebay sellers list them by the hundreds for absolutely nothing, £0.99 seems to be more or less the norm, and still they don't sell unless postage costs are also extremely low.
I think Lledo did many things wrong, and with all of these factors combined, we have the current situation where the models are practically unsellable.
The number of actual cars modeled was limited, but each one was issued in countless liveries. When choosing the cars to model, Lledo very often followed the beaten track and used cars that 'everybody' else had also made. The models themselves were 'sorta okayish', meaning that they were not really toys, but not superb collectibles either, and the toylike packaging didn't help.
For a collector today, there's no real incentive to buy, because the models offer nothing to go 'wow!' about, and you know that you can find similar, if not better, offers in less than 2 minutes if you decide to get one - and because the prices are already right at the bottom, there's nothing more a seller can do.
The future? Will values rise at some point? Maybe a little, but not by much, I think. The sheer volumes of them in circulation means that supplies are gonna last for a long time, and because they're not used as toys, few will get wrecked, which would help reduce the numbers. I also believe, that many have been stoved away by sellers hoping for better times, so for years to come there will be plenty of old stock to relaunch on the markets at even the slightest hint of a popularity increase.
I've only ever had a couple of them, one of them was a Morris LD150 in Kodak livery, and it was a perfect example of the problem with Lledo: it had more detail than a vintage Corgi (being much newer), but much less than modern manufacturers have to offer. If you want a vintage model, the Lledo is too new and if you want a detailed collectible, the Lledo isn't good enough.
All of this raises one big question, I hope that somebody who was collecting back then can help answer. Who bought these when new? I mean, people must have bought them, right? Or Lledo wouldn't have been churning them out in such massive volumes. Did they sell to collectors? or kids? or both? It was also mentioned that they were sold as some sort of subscription, like Atlas today, but again: were they really THAT popular back then? It seems that whoever bought them, no longer want them, and 99% of what's offered today is still very near mint, which indicates they're either (unsold) old stock or from collectors.