How do I find who hosts my website, the company I was using have gone bust, I have no details and unable to access my website to make changes
Welcome to the Cloudflare Community. 
If you have access to your Cloudflare account and it has the DNS records for your site in it, you can easily perform a whois lookup on the IPs. The IPs need to be the ones visible in your Cloudflare dashboard DNS app. The ones returned via DNS lookup will most likely be Cloudflare proxy IPs which will not help you.
If the hosting was in the account of a now defunct company, the provider very likely will be unable to grant you access.
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