Hello
This tour is now fully booked with 39 people travelling and ages range from late 30s to mid 70s.
By late May China should have quite nice weather, ranging from around 15 to 25 degrees Celsius. So you won't need to pack a heavy coat but maybe a couple of jumpers for when it is cooler, and also some light clothes for the hotter days.
Kind regards,
Olly, your editor