Mark,

first thing breakdown cover is a highly competitive business and you could hardly expect to beat the AA, RAC, Greenflag and Direct Line in their own backyard. Secondly I'd take a punt that having .co.uk domain has an advantage over a .net in a UK search. Lastly, I wouldn't recommend targeting MSN/Live. Aim for Google, its algorithm is similar and of course wi will deliver 15-20 times the volume for similar rankings.

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