Cheers folks - some insightful posts in this thread
I still wonder about the impact of the G-line; personally it seems like a super-niche, very limited-use product and at worst an act of flagrant bandwagon-jumping - "gravel's popular; let's push our product into that market".
That said it's possible that the difference between the G-line and more conventional offerings might have made all the difference to my commute if I didn't have the luxury of such a well-surfaced tow path.
Regardless, I don't think it's landed at a very good time - both in terms of the associated development costs and very subdued market. Pesonally I'd rather they'd spent their time working to resolve their existing products' prepensity for eating themselves..
It's interesting to look at prices. I recall when I bought mine in mid-2023 the general consensus was that the market was buoyant; which was very much at-odds with the wider industry. IIRC the new price of my black lacquer C-Line would have been £1640, with less tarty finishes at £1415. By mid-2024 these had risen to £1720 and £1495 respective; while today these models are down again to £1649 and £1415.
On top of that, as already mentioned there's also a free bag when buying from Brompton - which apparently retails at £180.
It's also interesting to note that a couple of years ago it seemed that all secondary retailers were selling at the standard RRP on the Brompton site. No, just looking at one I see that SJS are listing the black laquer C-Line explore at £1506 and the standard finishes at £1306; so quite a saving compared to their more widespread cost last year.
When taking a step back and considering the carnage that enveloped the bike industry after Covid, it does seem that Brompton were hit later than many brands and perhaps haven't been hit as hard.
Again, they do seem to be a bit of a special case so it's perhaps not surprising that this has panned out differently for them..