In message .com,
mikeyw wrote


My worry is the cabling is quite old and i've matched it up as follows
(Can you confirm this is fine) :-

As a guess


2black stands - into neutral
correct

3green/yellow strands - into earth
correct

4red strands - into live.
incorrect

You have a live supply (red) coming in. You connect this to one side of
the switch (red) i.e. only two reds connected together.

You need another connection joining the two remaining reds
One red will be the return from the switch - the other will be the live
terminal of the lights.

Does the switch need changing in anyway ?

No

- i'll need to check but I
believe there is a single strand of red cable going into the top (L1)
and then another out the bottom (L2)

That's OK

Any ideas on what is causing this and what I need to check ?

Check your other light - you may find that there are 4 sets of
connections and not three
--
Alan
news2005 {at} amac {dot} f2s {dot} com