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.

Manufacturer	Merriway
Part Number	BH01515
Product Dimensions	1.2 x 0.3 x 1.2 cm; 170 g
Item model number	BH01515
Size	2.5 mm
Colour	Yellow / Green
Style	5 m
Material	Copper
Voltage	240 Volts
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Included Components	Green/Yellow 2.5mm Cable
Batteries included?	No
Batteries Required?	No
Item Weight	170 g

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

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