This is a log that has been split to go on our fire. The dried log is very light which probably means that it is Willow and we do have willow trees in our garden.
The creature that chomped its way through that burrow was probably a beetle larva and possibly a member of the Longhorn group. Amanda suggested that it may have been a Cardinal beetle (Pyrochroidae coccinea).
Rather attractive beetles don’t ya think? However there is no evidence to show exactly what beetle it actually was so it’s all guesswork.