OK, before I post here, let me state on oath that I do understand what the thread is about.
It IS NOT about prices in the UK compared to prices in the US.
It IS about the relative prices of the two products in the UK, where there is a big price difference between them, compared to the US, where there is not a big price difference between them.
The actual price levels are irrelevant.
OK, here are my thoughts. It must be something to do with the structure of the UK market, or the behaviour of the retailers in the UK market, which differs from the US.
I think Frank is absolutely right here:
UK retailers will charge the MRSP for new gear to extract the maximum from those who simply must have the latest toys.
As I said earlier - yes there are people gullible enough to pay the full MRSP for something brand new. The retailers know this so they keep the price very high initially. Once all the stupid/rich people have bought their new toys then they'll drop the prices.
It happens with every bit of new gear, every time.
But I'm not so sure about this:
There are a lot more retailers [in the USA] and competition is fiercer. So they start discounting from the very start. Here in the UK there aren't as many retailers so there's less competition.
I don't think there's any real shortage of retailers in the UK, and there are sites like Camera Price Buster to keep them honest. Even if any individual customer doesn't use the price comparison sites, the retailers themselves certainly do, and the big retailers (WEx, Jacobs, etc.) make sure they know what the others are charging.
The Sales Director of one of the biggest UK retailers has told me that, once products are well-established, competition means that UK retail prices tend to converge on the lowest price they can afford to charge, i.e. cost price from the manufacturers plus a wafer-thin margin. That's certainly evident when you look at price comparison sites.
Here's an idea. Suppose just one major retailer decided that - for ethical or other reasons - they didn't want to price-gouge the customers who absolutely must have the newest kit whatever the cost. Then none of them would be able to. Is that what happens in the USA? (And if it is, maybe it is because there are more retailers out there, simply because it's a bigger country, and in a larger group there's more scope for one to behave a bit differently.)
Here's another idea. Why does the RRP for Canon products vary so wildly between countries? As Richard observed:
Canon's RRPs, at launch:
Canon Speedlite 600EX-RT US: $629.99 / EUR: €699 / UK: £679.99
From DPReview.
I think it's been established many times here that, once products are properly bedded in, there's often no significant difference in the prices in different countries - it's really just sales tax, import duty, VAT etc. which makes the difference. So why the huge variaton in RRP? It looks like Canon know that, in the UK, retailers will grab every opportunity to charge an early-adopters premium, so they set an artificially high RRP to give them the leeway to do that. But if the USA, retailers (for whatever reason) don't do that, so there's no point having a high RRP.
It's certainly baffling.