Last week I went to see a friends recently renovated open-plan kitchen/dining room. It needs a dining table to fit the new space, which reminded me about the clever Heal’s Designed by You dining tables I’d spotted a while back.  They’re stylish, versatile and, I think, excellent value for money. I’ve been meaning to write about them ever since I saw them and so, finally, here they are. Finding just the right style of dining…