Virgin Hub 3.0

> [...] GS108 switches [...]

   A different forum might be more appropriate:

      https://community.netgear.com/t5/x/bd-p/business-unmanaged-switches

> [...] I want to extend my ethernet capability by linking an ethernet
> cable from my hub to a switch - actually 3 in different locations.

   Sounds reasonable.  Cat5e or better cable?  Shorter than 100m?

> [...] these have stopped working in part.

   That's a bit vague.

> [...] cannot gain a good signal via wifi or internet. [...]

   Not a useful problem description.  It does not say what you did.  (Or
with what.)  It does not say what happened when you did it.  As usual,
showing actual actions with their actual results (error messages, LED
indicators, ...) can be more helpful than vague descriptions or
interpretations.

   "via wifi"?  What do these GS108 switches have to do with your
wireless stuff?

> [...] I get perfect signal on my work laptop [...]

   Again, not a very detailed description of anything.  To what is it
connected, how?

> Totatlly confused, [...]

   Same here.

> Any ideas welcome :-)

   Aside from asking in a better place, you might try to provide a
better description of what "cannot gain a good signal" means to you.
And a clearer description of what, exactly, is connected to what,
exactly, how, exactly.