Plug gap and type

Haynes say one gap size (can't remember what offhand 1.1 ???) but the plugs already in the engine I want to change are bosch, all with a different gap to the Haynes recommendation.

The bosch have performed well and are the right colour, not burn't or pitted etc but they are due for a change. My local spares shop suggest ngk.

The car had a full nissan service history when I bought it off an old couple who did no mechanics themselves.

I use it for regular mixed driving moderate speeds - recommendations please.
 
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