Wasn't there a thread on a Robin that ended up on a riverbed doing this, the pilot ended up dead on a mountainside in a separate incident.
The guy ( it will be a guy) is a certifiable moron. Hope the CAA throw the book at him.
I don't much care what the RAF do, they are seasoned pros who need extreme flying skills. This chap obviously has no respect for his family or anyone to care about him, no respect for the aircraft, no respect for the environment and no respect for the taxpayer who bears the SAR costs.