SL = Super Luminova, which would say they've been replaced as the originals would have been tritium to match the dial.SL is the product used on new watches, and all those made with the non T dials (ie just swiss made at 6 o'clock).
I've visited Watches of Wales a few times as they're ca 45 minutes away from my home. I'd say overall all their watches look very clean and presentable, perhaps due to over polishing and at the expense of originality. They seem to have a decent amount of repeat customers (footballers and rugby players feature somewhat !). They clearly do decent sales to warrant the shop in an arcade in Cardiff city centre, i'm sure many customers are impressed with how 30-50yr old watches look, and are not sufficiently informed to see how refurbed they are.
That price is probably negotiable, they'll be paying fees to Chrono24 (ca 4%) and whilst the price on their own website is the same they are offering finance which also costs them. I dare say a personal visit or telephone sale would knock a few hundred quid off it.
The ends of the lugs appear to be inconsistent to each other, particularly the upper right one on your posted images which has a pronounced curvature on the outer edge, whereas others are a sharper corner - perhaps camera angle/reflection ? Or indicative of over polishing ?
As you are finding its a difficult search - retailers will always polish up a watch to various degrees to get the best prices they can. Counter that with the fact its serviced and carries a warranty (worth ca £500). The US market if far far bigger, but to end up with the same GBP spend, you'd have to find a serviced, warranted watch for ca US$3300 and then stomach the shipping, import duties, VAT, handling fees etc. You could also look at mall.elady.com which is Japanese site - their watches are almost always polished (and some overpolished), but there will be multiple watches at those sort of prices to compare against
