I booked a tour for Stirling Castle/Loch Lomond for July and just received an email that the company is in liquidation and has ceased trading. It has been assigned an official account liquidator and has cancelled the tours, instructing people to contact their financial institutions to get refunds.
However, I went to the website and there is nothing on there letting anyone know what is going on. tTankfully my bank is letting me dispute the charge, even though it's a bit more complicated being international.
I'm posting this to perhaps prevent any other tourists from being otherwise inconvenienced, as I am now.
Even though I'm now annoyed, I still can't wait to arrive in Scotland in July.. yay!