Les wrote:

>   10R means 10ohms here in he UK, so does R10

  Umm, sorry, no it *doesn't* at all!  R10 could either mean, as was
mentioned, resistor number 10, *or* ten centiohms.  Well, actually, 0.10
ohms, though 0R10 is generally considered more proper.

  Many things, *never* ten ohms.
--
  Cheers,
        Paul B.