I need to mount this switch on a surface box. Do I need 30mm depth, or will a 25mm box do the job?

Hi. I have fitted my ones with 16mm surface boxes . So 25mm will do easily

For the single light switch are the holes present or do i have to drill out please ?

The holes are pre drilled the decorative covers push out then you push them it to hide the screws

Needs this for inside for 30w garden light switch

Yes it should be used indoors and will work with any light fixture including controlling an external garden light rated 30W. It would be advisable to earth it in case the external light develops any water leaks to prevent from electrical short circuit.

I need a switch that is downstairs and turns on upstairs landing light - there is a switch upstairs that also works same light - what switch?

Yes! this will work as it is a 2 way switch x 1 gang. If the switch downstairs has more than 1 rocker switch button on........then this is no good for your needs.

Manufacturer	Masterplug
Part Number	812-01
Product Dimensions	8.6 x 2.3 x 8.6 cm; 55 g
Item model number	812-01
Size	Single Light Switch
Colour	White Moulded
Style	Single Light Switch
Wattage	2.5E+3
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Switch Type	2-way
Included Components	1 x 1 Single Light Switch, White Moulded, 20 A, 2-Way, 16AX
Batteries included?	No
Batteries Required?	No
Item Weight	55 g

BG Electrical Single Wall Light Switch, 2 Way, Round Edge, Nexus 800 Series, White Moulded, 20A, 16AX, 812

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