I need to check the setting on the Honeywell Auto Bypass valve on my
CH. At the moment it's set with the pointer on the orange cap pointing
to the end of the white line with the number 1 just showing in an
anticlockwise direction. I don't know if that means it's set to just
below 1, or at the other extreme of beyond 6 (which it shouldn't be).
https://1drv.ms/i/s!AiVxJVaZTu60kpQ4zRZpSfa5RUsvVA

Also, how far out do I need to undo the locking screw for the cap
before I can adjust it, and do I need pull the cap out away from the
body in order to turn it. Reason for asking this is that the valve
tucked away in a corner, and I can only do this by feel. I don't want
to undo the screw to far that bits start falling off the dam thing.

What has prompted your desire to fiddle about with the settings?

On Mon, 11 Dec 2017 12:59:06 -0800 (PST), Cynic
wrote:

What has prompted your desire to fiddle about with the settings?
I think that the auto bypass valve has failed in the open (or partly
open position, the pipes on both sides of the valve are at the same
(hot) temperature even when the CH and HW zone valves are open.

As a test I wanted to try and see if I could get the valve closed by
adjusting it, but before doing that wanted to confirm what setting it
was at.

Since last post hav loosened the lock screw, but the orange cap
wouldn't turn in either direct. Took the lock screw right out, and
took the orange cap right off, together with the black dial with the
numbers on (noting the positions of both. Only the orange cap locates
on the valve spindle, the black dial bit just rotates freely with in
cap and when place on the valve. I can't see how the dam thing works!
Have taken some pics of the bits:
https://1drv.ms/i/s!AiVxJVaZTu60kpRF9uO3QrAnurZPJQ
https://1drv.ms/i/s!AiVxJVaZTu60kpRGFakpWlWLVw70iQ

With a bit of force I managed to free the valve spindle, replaced the
orange cap and that now rotates many turns in both directions. Haven't
turned it all the way in either direction yet in case it bu**ers the
valve (installation instructions says not to turn it beyound position
6 or damage to valve can result).

I'd not be concerned about a bleed through of the bypass. Many boilers run quite happily with a fixed bypass that allows sufficient flow to keep the boiler happy even if all the radiators have shut valves. Take a look at a centrifugal pump performance curve and see just how unimportant altered flow/pressure is to the pump.