
Having fallen 10-0 down at Old Deer Park, Morgan MacRae’s first try was converted by Max Titchener before another seven-pointer had the visitors in front.
Welsh regained the lead before the break, but two penalties and Lamb’s effort pushed Henley 27-15 in front.
The hosts cut the gap to five, but Macrae had Hawks firmly in command with a brilliant finish.
Yet their opponents struck twice in the final five minutes to snatch the win.
Mixed results for other loanees
Harry Bicknell, barring a yellow card, and Max Brown played the full 80 minutes for Oxford Harlequins in their 61-19 defeat at Sevenoaks.
James Gilman started at inside centre as Maidenhead secured a thrilling 34-33 triumph at Hammersmith & Fulham in Regional One South Central.
Victory lifted the east Berkshire side out of the bottom three.
Full-back Theo Pett-Ridge scored two tries and provided an assist as Maidenhead 2nd XV were edged out 17-15 at Milton Keynes in Counties Two Tribute Berks, Bucks & Oxon East.




