By bizn_fun 
The most common secret purchase for both men and women was clothing.
For women in relationships, beauty products were the most common, with a quarter of women saying they had secretly bought them.
Men said their most common secret spend was on vices such as cigarettes and alcohol, with a fifth (19%) saying they had made the purchases without telling their partner.
Men were also found to be more likely to use their cash for gambling or to send gifts to friends and family without telling their partners.
Gen Z, those born between 1997 and 2012, are more secretive with their spending than older generations, with an average of £4,303 in the past year.
Those over 55, meanwhile, spent an average of just £384 in secret over the same period.
AJ Bell’s personal finance director Laura Suter said a bit of secret spending “might sound harmless” but could potentially highlight “a much bigger issue around how couples manage, discuss and plan their finances”.