According to RepROM, the spec is 0.5mm (total) sideways movement at the wheel rim @ <35 degrees C on the centre stand. I have a DTI if you want to borrow that and get the reassurance of some actual numbers. I'd agree that the backlash (back and forth) movement is entirely normal.

Replacing looks quite involved, as you need to heat various parts to get the bearings out. If you're going abroad, I assume you've got BMW recovery in case it gets suddenly worse while you're away.

Thanks for looking that up, Andy!

I'm pretty sure it's less than 0.5mm sideways, but I may well take you up on that, thanks, but after Scotland. Whatever a DTI is. 
And I do have BMW breakdown. If it's like a front wheel bearing going, I presume I'll hear it squealing first, rather than wobble a lot?

And you're right, Rae. Beat My Wallet even.

The bike was MOT'ed but it got an advisory:
'Wheel bearing has slight play Rear (final drive bearing play)'

Anyone else had the same?
If so, how fast should I rectify it (I guess it's a fresh set of bearings, and a wallet whipping at BMW)?

From a quick measurement, in the radial direction there's maybe 1mm of play, just rocking the wheel back and forward. I'm pretty sure all my Ks have done that.
In the lateral direction (gripping top and bottom of wheel and push/pulling against the natural direction of movement) I can hear some movement, but it's too small to measure.

It's just that I'm off around Scotland for 1500 miles in 2 days time. 

But then again, they might not. And what you saying about my floor?

Mine is a light screed of gravel dust, splinters, fluff, leaves from last year, things chewed by a mouse, and concrete chips from a gazillion uses of the centre stand in the same spot for the past 28 years.
Those indoor wheels wouldn't survive 10 minutes. You're going to need a shiny painted floor that is hoovered once a week.
Which is, quite possibly, what normal sensible owners have. 

5 mins it is, Brian. My lack of reading skills. 15-love.

Ah, but here's how to save pain - with an exact link to the correct spot:
https://youtu.be/VNrWVbOCI6M?t=318
15-all.

I love the talkover
with edit chops when
something else gets said but
then there's
a gap whilst the non-AI-but-seriously-stilted
audio catches up with the
images on the screen.

How long before the little wheels clog up with fluff'n'gunge from your grubby floor?

Two small corrections, having ridden it back to NOG:

> Pros:
> - good suspension, better than a K

I preferred the K when I got back on it. Although the K is slow steering it is so planted. No twitchy bars over the bumps.

> Cons:
> -...but I had numb fingers on stopping (45 min ride), and now they're tingling.

No problem on the way back, so it was probably temperature-related, and not the bike.
But still not a bike I could fall in lurve with.

Today I went here/there after visiting that Compton Abbas airfield place for lunch. Someone must have told me about it previously ...

That would be Andym2. Take a bow, Andy!

The mud thing was annoying on my R1250GS, the rear of my lower legs would always get muddy. Coming from the K where nothing on me got muddy it was most annoying.

Spot on!
My right leg has crap up the back of it! That has never happened before. My leathers are normally er self-cleaning. I'm going to have to investigate cleaning products now. Grr.

And David - save your valuable time. You'll get no kicks out of it.
But I would agree that the RT format is a very pleasant, if chunky, way to pass motorway miles in peace.