<b><b>Jeremy Gates talks to Ronnie Hanna, chief executive of Bett Brothers of Dundee, who says he is heading south</b></b><br><b>Twenty years ago, Ronnie Hanna went on a buying spree - transforming Cala Homes from tiny Scottish property group to nationwide developer with such mouth-watering prospects that the management eventually could not resist the temptation to take it private.</b><br><b>In 1992, Hanna moved from Cala to Dundee-based Bett Brothers - then a minnow with &amp;£7.5m market capitalisation and serious doubts about long-term survival after the collapse of a major commercial project in Surrey.</b><br><b><b>Southbound</b></b><br> Nine years on, Bett is worth &amp;£40 million-plus - and plenty of housebuilders around Britain who have bought its shares eagerly await Hanna&amp;’s next move. At the tender age of 59, he is ready to hit the road south on another expansion trail.<p></p><p>&amp;“You have to respond to opportunities as they present themselves in our business,&amp;” he says. &amp;“The next obvious target areas for us are Yorkshire and Birmingham - though we&amp;’ll need to send missionaries down from Scottish head office when we do it. It&amp;’s much too risky to open a new area with new people and new subbies.&amp;”</p><p>In the new year beginning September 2001, Bett plans to lift housing …