Thanks for the responses guys
I had a look at the Biobees website and downloaded quite a bit of info on hive construction. Although they are obvious advocates of this method they suggested that top bar was more sympathetic to the colony, not needing the inputs that the more intensive langstroth hive need. I'm not really after pounds and pounds of honey, as you say, to produce a few jars of your own sweetness is a reward in itself.
I loved the fact that I (with my limited woodworking skills) could quite easily (and cheaply) make my own top bar hive, there was also a design with a small window through which you can view what is going on. As someone who works in the countryside I am very much in support of our industrious little bees and all they do for our wild flora; honey would just be a fascinating extra!
I do have a couple of people to call upon for advice, one being my father (who is an advocate of the more intensive method) and an African lady who suggested I try the Kenyan top bar method...
More research needed but looking forward to the challenge!
Leo