I am down to my last 2 big 3rd party vendor purchases for a new bike, the shield system and the rear rack system (I will just tie-down soft luggage to rack, if needed.) Both the companies I do not know the most about are British, so please do not continue reading if you are tax sensitive or do not like incomplete deceptive ads. I always think I have it all covered from 4 or 5 different separate tax charges, when dealing with UK (or Australia), and end up with another $90 plopped on my credit card from last minute Queen's tax.
Of course this changes the cost benefit comparisons and after the fact: 2 months after you bought it! No one in UK knows anything about it until it's history. Maybe that's why I don't see a lot here about these companies! No one knows anything about the Queen's tax except it sucks, and is about $90 per $100 spent/shipped (on top of 4 or 5 separate tax and shipping charges charged before shipping.)
NOTE: that's RETAIL dollars/gbp taxed. They have gov't workers finding retail dollars on every sale item and adding sequential Queen's tax rate up as if you were fool enough to pay retail on an obsolete/old part.
The first company I do not see a whole lot about is Palmer.
Their windshield kit looks exactly like the Madstad Engineering windscreen adjustable brackets ($276, including windscreen.) Palmers with hand-adjustment knobs is 67.5 gpb (10 more for black paint) X 1.2 (up front ship/tax rate) x 1.55 (gbp/usd rate) = $126 times queen tax 2 months after you buy it when you receive it (x 1.9) = $239. So Madstad gives you black paint and a windshield for $280 (est. about $120 for large shield difference).
I really don't need the adjustability because I'll have the Givi AirFlow shields. What the AirFlow does is it compresses the air over your head at any speed: so the shield adjustment would be minutia in comparison (although still better with both I'm sure, but it is STILL variable and requires constant adjustment with speeds/wind direction.) Some adjustment would help me dial it in faster/better. I will check Madstad's price without the windshield before I totally scrap the idea. All I'll have to do is replace the stock fasteners with 1/4" nylon screws and ss nuts for larger wind pressure surface, which is starting to sound better after doing the math. UK vendors always sound great until you add the 90% Queen's tax on top of 20% Queen's tax and shipping (i.e. a seemingly good deal of $104 (67.5 gbp) turns into a nasty $239 after 2 months of waiting and absolutely no warning from any bloke in the UK. Yeah, I can now pretty much do without this unless deemed necessary, and I'll probably deal with MadStad like other members here have.
My next product from Palmer which seem interesting, or initially cost competitive was their rack.
With side brackets (for side cases??) complete (and no 10gbp black paint) for 109gbp (x 1.2 initial queens tax x 1.55 gbp conversion rate x 1.9 the queen's great/late/phantom screw-you tax) = $385, wow. That $168 balloned up quickly too. F&#k the Queen! However the rack did not look bad, and they kept referring to pictures of a backrest that were not there. So if you live in the UK, it might be unlimited choice of nice things at a bargain, but I would not be bold enough to proclaim that given the over 200% taxed items looked at.