A quick search found a great history of McMichael, a very interesting company;
http://www.ingineur.co.uk/McM/index.htm
Click on the history tab for the full history.
And a product lineup also;
http://www.thevalvepage.com/tvmanu/m.../mcmichael.htm
Your set appears twice. Once as a tv only and later as a tv or tv/radio. Same 12" set every time. A quick search of ebay UK showed some McMichael radios and radiograms but no tv's.
I use this link to search UK television sets;
http://collectables.listings.ebay.co...istingItemList
Dave A