Sorry @Bozza - not what you want to hear but I don’t do X so can’t help on that front but good on ya!
You could try these people - they may be able to assist with any legal claims
https://www.ukecc.net/
Are you sure - ? Looks like Accor use a fielded out hosting/management site for all their online bookings to me so they may very well be 3rd party contracts - if so, the beef would more likely be with the actual hotel I would think. Just because the hotels are called ‘Accor’ on the website it...