Please could you tell me if the 2.5mm diameter of this cable includes the green and yellow outer part, or is just the copper inside's diameter?

The 2.5mm diameter refers to the copper section.

From the photos and (one) review this looks to be stranded, is it flexible or stiff wire?

Mine was single strand stiff copper wire.

Can i use this for the second earth on a double socket or do i need a single copper earth

Not sure what the question means. A standard double socket will usually/often have a common earth connection for the socket (both sockets), rather than them being independently earthed. If there was any worry about the earth connection and a need to run a second earth connection (to a suitably conductive pipe, for example, which will need an earthing strap) then yes this should be fine. If you just wanted to connect two earthing points within the socket for some reason, again, fine; but the earthing connection will only be as good as the 'primary' earth on that basis, of course, and this won't add additional protection.

Thanks, big man, for answering, but i didn't explain very well what i meant; is the 2.5mm diameter the cable, or just the copper inside's diameter?

Its not the diameter. 2.5mm squared is the total cross sectional area of the copper conductor, which defines its current carrying capacity. I don't know what the diameter of the cable is but I could measure it for you if it would be helpful, as I have some of this cable at home.

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Merriway BH01515 Single Core Round Earth Cable, 6491X 2.5mm Yellow & Green, 5 Metres (16.5 feet)

Merriway BH01515 Single Core Round Earth Cable, 6491X 2.5mm Yellow & Green, 5 Metres (16.5 feet)

Product ID: 54781905

Details

Brand
Merriway
Colour
Yellow / Green
Material
Copper
Number of cable strands
Single-strand
Voltage
240 Volts

⚡240V rated for reliable power

📏5 meters length, perfect for precise installations

🧵Single core, 2.5mm thick copper wire

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Description

⚡ Ground your projects with confidence and style!

PREMIUM COPPER CORE - Single-strand copper ensures optimal conductivity and durability.
PERFECT 5 METER LENGTH - Ideal for consumer unit meter tails and precise electrical setups.
UK MANUFACTURED QUALITY - Trusted Merriway craftsmanship, made in the United Kingdom.
RELIABLE 240 V POWER HANDLING - Engineered to safely conduct standard household voltage with ease.
VIBRANT YELLOW GREEN INSULATION - Instantly recognizable earth cable for safety and compliance.

The Merriway BH01515 is a 5-meter, 2.5mm single core earth cable designed for safe and efficient electrical grounding. Featuring a durable copper conductor and bright yellow-green insulation, it meets UK standards for consumer unit meter tails and general electrical wiring, ensuring reliable 240V performance in your installations.

Specifications

ASIN	B00JIL9BY8
Best Sellers Rank	29,827 in DIY & Tools ( See Top 100 in DIY & Tools ) 141 in Electrical Wire
Brand	Merriway
Colour	Yellow / Green
Country Of Origin	United Kingdom
Customer Reviews	4.8 4.8 out of 5 stars (212)
Global Trade Identification Number	05013249347718
Included Components	Green/Yellow 2.5mm Cable
Item Type Name	2.5mm Single Core Underground Cable 6491X, 5 Metres Yellow/Green
Item Weight	0.17 Kilograms
Manufacturer	Merriway
Manufacturer Part Number	BH01515
Material	Copper
Model Number	BH01515
Number Of Wires	1
Strands	Single-strand
Unit Count	5.0 meter
Voltage	240 Volts

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