Need artist's name

Well, once again Allmusic.com is failing me so I’ll try here. Your vast musicical knowledge came up with the answer in less than an hour last time; let’s see how well it works today.
I was at the gym again and their piped in muzac (?) played a song I liked and didn’t know. It was an up-tempo, slightly overproduced (lots of horns, big sound, maybe British?) song with a soul, Motown feel to it (but only just a "feel", I wouldn't classify the song as soul. Sounds like it was produced in the last 10 years) but I’m pretty sure the male singing was white. The chorus repeated the refrain, “I’m a full grown man”.

Mucho Thanks