Right, sorted! 
I used the Chrome inspector (it's very nice, better than the Firebug for Firefox I reckon) and I found a css clause on line 34 of style.css that set borders to 0. So I disabled that and instantly saw that the text I wanted centred in the spanned cells WERE and that the other text was bang on the left border. I've now changed the css for tables (line 800 of style.css) so that border-top is now border.
Cheers for all your help. I might tidy the code up later by giving the table an ID and set the css I've just changed now to be specifically for that table so anything else is unaffected.
I used the Chrome inspector (it's very nice, better than the Firebug for Firefox I reckon) and I found a css clause on line 34 of style.css that set borders to 0. So I disabled that and instantly saw that the text I wanted centred in the spanned cells WERE and that the other text was bang on the left border. I've now changed the css for tables (line 800 of style.css) so that border-top is now border.Cheers for all your help. I might tidy the code up later by giving the table an ID and set the css I've just changed now to be specifically for that table so anything else is unaffected.
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