Snowslider - I'm interested in you comment about qualifications. Care to elaborate?
For leading walks in the UK qualifications would be the WGL (walking group leader) or Mountain Leader Summer/Winter. There's no legal requirement for anyone to hold either but someone leading groups commercially without them isn't likely to be insured as the insurers require that the responsible person is suitably qualified. In some environments your own personal insurance can be invalid if your leader isn't qualified, this is more an issue in the alpes but I wouldn't be surprised if a life insurer declined payment if the policyholder dies while under supervision from an unqualified person.
In France it's a legal requirement that leaders are qualified and that means holding an IML (international mountain leader) ideally with local equivalence, in that case anyone operating without it in France is not insured and is also breaking the law. For other European destinations, typically the alpes it's the same and the qualification required is either an IML or an IFMGA. If I might make a suggestion for the site, it's that the listings section only contain providers who are qualified and insured.
I'm not making any judgement on the skills or experience of some of these operators which I'm sure can be excellent but they should be qualified and anyone booking trips like this should be checking the leaders are qualified. In the first instance, ask the operator and if you need to check further then you can contact the governing body and confirm it personally.
I've no reason to think there's anything wrong with this provider and they quite possibly hold an ML already but didn't put it on the website.
just my twopenneth worth !