Helo and Chris_Butler,
To answer your question, no the regulations haven't changed recently. Window blinds must be open on all doors and emergency exits ie overwing exits. However there are no regulations covering normal windows. This is down to each individual airline to decide. Some ask that all blinds be open and some don't. BA don't for example but Britannia did and I assume that is still the case at Thomson. That's been the regulation for as long as I remember. I hope that helps.