Yep I tried for ages to find a way of getting FH strobes to the UK and just stumbled upon the ebay US store route by accident. Anyway my M2P is now festooned with FH strobes and about as visible as I cam make it.That's the FHT ebay store (Willoughby, Ohio).
Amazing they will ship to the UK from sales there, because they won't from their own website store (or Australia, or Canada even).
Worth a shot though, nothing to lose trying to buy some ex ebay.
If you got ARC XL from them then they may have changed this policy recently, those are a fairly new item.