It is worth noting that testing and tagging is not a mandatory legal requirement, which most people are unaware of. It's about risk management, not blindly following pre-set intervals. — Craig Marriott
Test and tag is not mandatory. We have changed our policy so that office stuff is just subject to a visual check of cords, plugs etc. which anyone can do,
than a 6-month/12 month/18 month/5 year testing schedule.
Consider the cost and quality of your multi-plugs as you generally get what you pay for and their overload protection does wear out which can lead to fire.
As for double-adaptors; work places might do well to ban these altogether as they have no overload protection and rely solely on people using them wisely.