Interesting statement, and of course you may be right - let's see...
AD200:
Lencarta £319
Pixapro £330
Photomart £279 + £55.80 VAT = £334.80
AD360-2:
Lencarta £449
Pixapro £470
Photomart £391 + £78.20 VAT = £469.20 (but includes transmitter)
AD600 TTL
Lencarta £620
Pixapro £700
Photomart £516 + £103.20 VAT = £619.20
AD600 1200Ws Remote Head:
Lencarta £239
Pixapro £250
Photomart, Not Listed
AD600 Mains adapter:
Lencarta £119
Pixapro Not Listed
Photomart, £89 + £17.80 VAT = £106.80
So, Lencarta is cheapest on almost all, Pixapro and Photomart are the most expensive, Photomart are very slightly cheaper on a couple of items, ranging from a few pence to a few £ but on balance, I'm right, and if you're buying several items I'm even more right
.
Lencarta are selling all products at the lowest price permitted by Godox.
There may of course be other UK sellers that I don't know about