Under which UK regulations must reports of accidents and incidents at sea be made by masters of UK ships, and which M Notice explains their requirements?

The Merchant Shipping (Vessel Traffic Monitoring and Reporting Requirements) Regulations 2004 (SI 2004/2110) ("the Vessel Traffic Monitoring Regulations" or "VTM Regulations"), as amended by Sis 2005/1092, 2008/3145 and 2011/2616. The amended VTM Regulations give effect in the UK to Directive 2002/59/EC (the "Vessel Traffic Monitoring Directive" or "VTM Directive"), as amended by Directive 2011/15/EU. Their requirements are explained in MSN 1831 (which replaced MSN 1817).