It is an Aerosvit flight from BKK to KBP. It is due to cancellation and rebooking on their next flight. Decided just to never use them again and will just pay the extra and fly with someone else in future. Would be a long drawn out process to try to get compensation and not worth the hassle. Very poor customer service from an airline.
Should have looked at reviews prior to using them, all very bad. Worth paying a bit extra and going with a proper airline.
Thanks for the info provided though. Its appreciated.