Aye Oz,
Yamaha singles, looked after are pretty bomb proof, cheap to run and easy to maintain. The BMW may look alright, but you pay 'fashion' prices for some dubious engineering and cheap jack fastenings behind the stainless externat fasteners and plastic bodywork, not cheap for parts and expensive to fix.
Might I also suggest a wee 'looksee' at a KTM 390 Duke? Light, poky motor (44BHP) and 150Kg weight, with a top speed just over the 'ton' and 60mpg!

I have a friend in IoM, who has one and swears that it is the ideal bike for the majority of roads, apart from the "flat to the tank blast over the Mountain", but probably quicker through all the twisty bits than a lot of other bits of kit. Comfort seat option, Akropovic 'silencer', rear tail tidy and removal of the garish 'stickers' recommended along with a pair of 'sticky' tyres. A 2014 model without the ABS and with only 840 miles from new made £3,150 on Ebay. I am tempted, but I'd have to sell before I bought.

Enough of my procrastination, but it may give you another option.
My regards, Bill