Where to buy 1 or 2 meters of cable

Only a rgi is permitted to work on a gas boiler

only a rec is permitted to work on the distribution board (if that’s wherever you are wiring the 10mm earth to)

time to get the professionals in op. If the gas boiler is being replaced then this rgi is permitted to connect the boiler

CWE In Coolmine

if it''s just the timer you'll be fine as you say.

Amazon if you can wait a day or two for delivery?

Gotta love replies like this. Answer to a question that no one asked.

Since you seem to be prescient, can you help me too?

I just wired in a 3 zone boiler controller, plus I rewired the entire boiler / zone valves / tank thermostats system (original electrician who wired it made a balls of it so I had to fix it). Plus I added thermocouples and a relay board to my Eddi to control 3rd 2 way valve.

Can you tell me how many major mistakes I've likely to have made because I'm not 'RECI'? DO I also only think I know what I'm doing?

Good for you , but you haven’t a leg to stand on if someone got a shock off your work ,

all lsf cable used ?

all local isolaters used ?

all rcbos used ?

IR test done ?

RE-RP done ?

continuity of all conductors?

loop test ?

rcd test @1 & @5 times ?

Its doubtful any reference was being made to reci status.

do B&Q sell cable cut bye the metre ?

What major mistake do you think they are likely to make?

If it's a major, dangerous mistake, wouldn't it be far better to be upfront about what it is for safety's sake, rather than be so secretive about it?

The secrecy is what breeds the thoughts on protectionism, as it puts safety secondary to professional knowledge.

Saying "make sure to do XXX, but if you're not 100% sure, call an electrician" is a much more reasonable and helpful answer.

The alternative is that they go ahead anyway, without any knowledge of the potentially dangerous mistake. If the information is that important to safety, then withholding it isn't exactly in the spirit of promoting safe electrical systems.

If someone on the Motors forum was to ask where to buy a roll of brake line, it's unlikely to descend into a discussion of "bring it to the mechanic", "I can think of at lease one major mistake the OP could make here", without actually saying what that might be?

The list of test posted by @JL spark is helpful, of course, but to be honest I've yet to see an electrician pull out any test equipment whatsoever when doing minor work in my apartment (it was renovated just before I moved in, and a few electrical issued remained which required a few call-outs by different RECI's).

In any case, doesn't what the OP describes they want to do fall squarely in the definition of Minor Electrical Works, as it's a like-for-like replacement of a (timer) switch?

https://safeelectric.ie/help-advice/controlled-restricted-electrical-works/

Once it works, it must be done properly......

theres absolutely no way this is minor works

the op is looking for 10mts of 10mm earth which will need to be connected into the distribution board. This can only be done by a rec

the op also states that he’s only connecting the time clock and not connecting into the boiler itself (only a rgi is permitted to remove the cover of a gas boiler.)In my experience most boilers require a 4 or 5 core but I’ll take the op’s word that he’s not doing this connection

the op states that he Re wired the house 30 years ago. A lot of regulations have changed since

I wonder if there’s rcd protection on the boiler/pump circuit

if a new earth is being run to the boiler then I’d advise an independent,rcbo circuit is installed at the same time

im surprised you’ve had rec’s work in your apartment and no sign of any test equipment. Most competent rec’s would do a couple of quick tests before undertaking any electrical work.