It beats me how BMW market a bike that can ford rivers adventure fashion, such is their glossy advertising, yet no longer supply a long reach box spanner costing pennies in order to remove the spark plugs in the event of water ingestion.
I know a rider who shall remain nameless who owns a late 2004 R1200GS but sadly has the later crap toolkit. I wasn't with him the day he went fording (hence no access to my older and more comprehensive toolkit from my early R1200GS) and suffice to say he couldn't remove his spark plugs to pump out the water and ended up with expensive engine damage, thankfully now fully repaired. Not good on an 'adventure' bike with a reputation for strength and durability.
He now has the required tool for the spark plugs just in case, but thats like shutting the stable door after the horse has bolted.
I would strongly advise all R1200GS riders who read this post to check their toolkits for the deep reach box spanner for the spark plugs. If its missing, get one ordered ASAP for the tool roll. It could just save you from embarrassing and expensive engine trouble, or a long walk home (or both).