Julian,
Experience with my Arca's (F, F-metric and M) and other cameras i have handled at dealers/trade shows was that their operation was consistent between cameras. About the only difference was in the geared movements (some being a little stiffer than others).
All new cameras need a little break-in and this may help with yours. Some owners need a little break-in period also :=) . Without seeing your camera, I cannot say whether fit, finish and build quality are consistent with other Arca cameras.
You said you purchased the camera from Robert White in the UK. I have no experience with them but I would bet they are one of the largest Arca dealers in the world and are fully knowledgeable about the camera. Talk to them.
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