Yes, only the last remaining ex-GEC/Davis lanterns are produced in the UK by WRTL. I'm pretty sure all other Indal WRTL lanterns are produced in the Netherlands, and I expect most if not all Philips lanterns are too, although I can't say that for sure.I don't think the SRL8/MRL6/PTL ranges have that much life left in them now and sad though it is to say I have to agree that the future of the WRTL Tipton factory does look to be murky now Philips have took over.
It is Britain that has been keeping Philips and Indal strong through the last decade. I can't remember the statistic I heard, but let's just say Britain buys more than its fair share of Iridiums, and I'm sure Britain buys more than its fair share of Arcs and Libras too. Street lighting PFIs have resulted in sudden orders of tens of thousands or hundreds of thousands of lanterns, with each order having to be supplied within a 5 year period. In contrast, most other parts of Europe are still just replacing a little bit every so often rather than relighting every single street light in whole regions. Some are doing bulk replacements, but generally these are places with large stocks of mercury lanterns.PFIs must be a great thing for lantern manufacturers although it must prove a challenge keeping up with the increased demand. Plus there is the future problem that once the 5-year (for example) PFI period is over that demand will reach a serious low in this country with so much up-to-date lighting on the streets and little call for lantern renewal for many years to come in a good few areas. Perhaps it is a good thing that Europe has so many countries that still have aged mercury lighting needing imminent replacement to keep Indal/Philips going in the years to come.