holland25 wrote:

Are they all from Singapore? Because if yes, then they're some new (probably Google) crawlers and bots. I've had quite a few visits from those in the last 14 days too

Yes, the increase seems to be driven entirely by hits from Singapore.
 

holland25 wrote:

Yeah, thought so. Unfortunately, there isn't anything you can do about them. They will have to stop coming on their own

Thanks for your advice.  Much appreciated.