Add format parameter to external link tracking url
Add format parameter to external link tracking url

This can be used in the varnish logs to extract the format of the url.

tadast/static,tadast/static,kalleth/static,alphagov/static,robinwhittleton/static,robinwhittleton/static,tadast/static,robinwhittleton/static,alphagov/static,robinwhittleton/static,kalleth/static,tadast/static,alphagov/static,kalleth/static,kalleth/static