The accounts showing a loss hit the press last summer. However accounts are always quite historic even by the point they are filed- bigger question is whether they have turned things round since to stem the losses. There doesn’t seem to have been negative press/speculation about their financial situation since, which you’d normally expect if they were about to go bust.
The pension scheme isn’t a big cause for concern. Plenty of big companies have them and have to make contributions.
I’d be more concerned about current signs- stock levels, putting off dishing out vouchers, making it had to spend credit. However, as I said before, could just be incompetence as lots of these issues have been going on for ages.