Do I have correct spark plugs in my late 2009 3.0 N52?

[Bluebottle]

BMW Z4 30 i Sdrive built Nov 2009 128,000 miles

Off for a 800 mile road trip around Wales soon. Too late to replace water pump, but thought I would check service items as there are no receipts for it when bought six months ago.
Removed Denso IKH20TT plugs; managed to loosely fit 0.9mm gauge in gap (should be 1.0mm) and they look fairly clean so assume they were fitted last year.
I would always fit NGK or Bosch and web search leads me to believe these Denso may not be the optimal plugs.

Any advise please

The coils are unmarked except for CUF2846 Which seem to be ebay specials.
And one has just come apart whilst trying to pull it out! :w00t:
Fortunately GSF are open for another 30 mins and have Bosch coil on shelf. :yeah:

Thanks

 

[Varixto]

I also have a 30i Sdrive. The correct part number for the spark plugs is: BMW 12122158253. The gap should be 1mm.
After having a look in Autodoc, the only spark plug that exactly matches this part number is this NGK plug. Link: https://www.autodoc.co.uk/ngk/7152653
I will eventually replace mine and these are the ones I will go for.
I hope you found this useful.

 

[Bluebottle]

Extremely helpful, thank you Varixto.