Just swapping for a waterproof switch it’s a two way in the garage,old wiring not marked up three reds 2x2.5 and a 1mm or 1.5.
To the old switch marked 1,2 and 3 the 1mm or 1.5mm was in terminal 3,one 2.5mm was in 2 and the other in 1,both lower terminals marked out and top one in.
New one has...