Lets see Dirk what I can come up with...
Looking in RAF Fighter Command losses Vol 1 for May 18th
145Sq Hurricane I N2600 P/O M A Newling baled out after combat with He 111 16.25H near Brussels. Safe
601Sq Hurricane I L2034 S/Lt L E Guiness damaged in combat with He 111, aircraft left abandoned at Merville
Note that 601Sq also had another loss that day, but that was in combat with Do 17 earlier in the day
Cheers
Stig Jarlevik