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Do you need 4 core to get the strap line for 2 way switching?
Twin and Earth is the most common type of household wire. It comes in many varieties but the 2 principal types are used for either sockets or lights. You can use 2.5 T&E for lights, it's just more expensive. You need to have cable which has a higher capacity than the breaker on the circuit. In your case the smaller 4 core will probably do it but you need to establish that yourself.
Airhead
@dangeek
I’d like to add a second light switch in my garage, I’m confident about how to wire it but what cable do I need to order? I thought it was just called ‘twin and earth’ but looking on screwfix there seems to be different types.