From British Medal Forum:
This is the information he needs, from Seedie, Fevyer and Colledge.
Leading Seaman Arthur William Bennet, RNPS was awarded the Distinguished Service Medal in the New Year Honours of 1942 - London Gazette of 1 January 1942 - and was presented with his award at an investiture on the 3rd of March 1942.
He was serving in the trawler HMS "Damito" which had been requisitioned as a mine-sweeper in August of 1939.
It is very unlikely the original recommendation for his award survives.
The medal is know on the market, being sold by Glendinings in June 1989.
Ady