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Top picks: Obmyllax 40th Birthday Gifts for Men Whiskey Glass Set (best overall); XIANNVXI 40th Birthday 3D Crystal Ball 60mm if he wants a keepsake for his desk; Custom Moments 40th Birthday Heat-Sensitive Photo Collage Mug if he likes a photo surprise.
For a 40th, think about where the present will live once the party is over: in the drinks cabinet, on his desk or in his work bag. Under £30 that leaves room for one proper keepsake, or a box of everyday things that each carry the number.
The Obmyllax 8-in-1 set centres on an 11 oz whiskey glass engraved "Aged to Perfection", with an apron, cap, socks and bottle opener packed in a black gift box.
Worth knowing: Skip if he does not drink spirits.
XIANNVXI laser-engraves "Happy 40th Birthday" inside a glass ball that sits on a light base with 7 colour modes, so it doubles as a night light.
Worth knowing: Skip if he keeps his shelves free of ornaments.
Custom Moments makes a ceramic mug that changes colour when a hot drink goes in and returns to its original colour once cooled.
Worth knowing: Skip if he drinks from a travel cup all day.
Joybble's box holds a 20oz double-wall insulated tumbler for his morning coffee, along with cotton socks and an engraved metal keyring.
Worth knowing: Skip if he already carries a flask.
The CheriGift toast is hand crocheted from cotton yarn and carries the pun "Here's a LITTLE TOAST to your 40th BIRTHDAY", a small ornament he can keep.
Worth knowing: Skip if he has no time for cute things.