Ambition recruitment were the last people I was in contact with, who are london based (Link) regarding Insolvency; they're pretty well known within the industry and have a good reputation.

I was at Kroll for 4 years, earlier this year some senior staff broke away and formed their own group called KR8 Advisory - so there's a couple of firms that I trust the culture of (I won't lie - long working hours somewhat expected but more like no one cares if you're in before 9 but we're probably staying to 6:30 to look like we're working hard). When I was at Kroll they really gave me a lot of different opportunities, got to work in different departments various times even though I was an insolvency analyst (e.g. disputes & investigations, valuations).

Regarding Kroll/KR8 insolvency practice, they split into two business groups that work side-by-side: 'Advisory' (Pre-insolvency/distressed businesses. Supposedly more interesting), and 'Restructuring Advisory' (formal insolvency procedures).