Fortunately Plusnet have been dutifully renewing the domain name (apparently without asking for payment), and the domain is correctly pointing to Plusnet DNS servers, so luckily there is no issue with Nominet here.

It does appear Plusnet's DNS servers are serving no records for the domain name though, most likely for billing reasons as you say.

Oliver

Look like posting on the plusnet forum might have borne fruit. one of their support staff is looking into things. Hopefully he can sort it.

Thanks for your help.

Mike