Just to add to this for anyone else: the booking flow is bad and the baggage allowance was as clear as mud for me.

Unfortunately it was the only airline that had appropriate timings (MS departed at midnight or 8pm - this flight was at 4pm).

Their website seemed to be under some sort of attack and I always got a CloudFlare message. When I managed to get through to the actual website it commonly cries an error about Insufficient storage...

Going through Google flights gets me through to their booking engine, but it seems that they purposely do not accept credit cards for payment. I tried a Mastercard Credit then a Visa Credit (Amex wasn't accepted) and I had to default to my Visa Debit. Perhaps they are aware of a UK traveller's Section 75 on their credit card?!

Baggage doesn't appear to be included (I could not find any mention of baggage for domestic flights) so I added 2 bags for safety. I am not sure of the weight allowance; again, it's not mentioned during booking or on the website (except that it can't be more than 32kg for safety reasons - understandable).

After booking the electronic ticket states that 1 bag is included, as well as the message 'PBAG - WEBSITE EXCESS BAGGAGE IN PIECE - CONFIRMED' suggesting that I have 3 bags (1+2 bought) allowed for check in...

Really hate it when carriers make it really difficult to comply with their rules and regulations... if there are any!