Logs suitable for swedish candle making (Brasenose OX11)

Hi all. I am one of the scout leaders at 15th Didcot Scouts. We want to make some Swedish candles with the troop for a Christmas camp in a few weeks. I thought I'd got some suitable logs in my garden but on inspection they are not as good as I'd thought. If anyone in the Didcot / Harwell area has 2 or 3 good sized logs that I can use that would be amazing. I've added a photo of a swedish candle log in case you don't know what one is :)