I received the 2 Parf dogs and two small dogs today. They were very nicely packed and are beautifully made (as one would expect from Lee Valley). I tried setting up a cut to see how square the guide rail was to the long edge of the workpiece and it was absolutely perfect! I checked the diameters and they were all 19.90mm. There was a bit of wobble in the dogs which I thought might be an issue with the Parf (ie taller) dogs particularly if thicker wood was being cut so I used the knobs on the clamping elements to tighten them down - this got rid of the wobble completely. I can't imagine there would be any significant error with these dogs as they are machined to such tight tolerances and therefore the pair responsible for alignment in each plane are perfectly matched (indeed all four are perfectly matched). I think the diameters are probably just right as they would be difficult to insert if they were any larger.
I don't recommend importing to the UK as it is too expensive. The dogs themselves are a bargain at 35 dollars (2 Parf, 2 normal) but reasonably quick postage to the UK (3 working days) is another 35 dollars (UPS) and duty and brokerage fees adds a massive £20.65 bringing the total cost in sterling to £65!
I have been in touch with Axminster to find out how much they will charge and they said £17.75 for a pair of Parf dogs and £13.20 for a pair of small dogs - both prices including VAT. They have now placed their order and expect stock to be available within 6 weeks (this just based on past experience).
I think this represents a bargain.
T15+3 set, CXS set, Centrotec set (2011), TS55REBQ, TS75EQ, 1400 rail, 1900 rail, 1400 LR32 rail, LR32 set, MFT/3, OF1400, OF1010, Guide rail adapter, edging plate, angle arm, chip catcher, small bore base, MFS400, MFS1000 profiles, RO90DX, RO150, ETS150/3, Domino DF500, Domino assortment systainer, CTL Midi, compact cleaning set, CMS GE, TS75 Module, OF Module, VL and VB extensions, LA Stopper, Sliding table, Carvex 420 Li 18 GG, core maker set, EHL65EQ, Syslite.