OK. So my HDR-FOX T2 should also be working.
Although you previously have had difficulty with your Humaxies, comparing your experience with mine on those occasions you have managed to get a lot further with Internet Radio connectivity than my current situation.
Unlike 5 weeks ago I have recently accessed my router settings. Like you I find that a bit odd if my router is allowing iPlayer but not Internet Radio, but your mention of routers does suggest a further avenue to explore. Unfortunately I have run out of time to fiddle for now.
Thank-you for your help and time. Your postings are very much appreciated even though I have not, so far, commented on some of your suggestions.