If you're new to all this and wanting to buy bitcoins on localbitcoins, ignore the 'buy bitcoins online' section and instead go to 'post a trade'. By doing so, you will get a much better deal. eg, today's cheapest 'buy online' price is £495.94 (GBP), whereas you can get them for £478.10  by posting a trade.

Hope this helps someone. Wish I had worked it out sooner. DOH!