Towergate have undergone a major restructuring, basically selling off big chunks of the business to reduce their debt. I had my business and home insurance with them, the business stuff was unceremoniously traansferred to another company only a few weeks after renewal, and I had a call just yesterday from a company I'd never heard of which claimed to have taken over the TM home insurance book and offering me an instant quote.
If you have your boat insured with them your cover should still be OK even if TM go down the pan, because it'll actually be with Royal Sun Alliance or another company whose name escapes me. Worth just checking the policy, though
Tim