I use the Tea Tree Cool and Creamy Cleanser twice a day, the mask once to twice a week, and the Squeaky Clean scrub once a week. I also spot treat occasionally with pure Tea Tree oil.
I would say the Tea Tree in the body Shop products are probably diluted so it should be fine to use the cleansers, masks, and exfoliates as you have been. Pure Tea Tree oil can be strong and harsh if used too often. For instance, if you are spot treating and get the oil on the surrounding skin, it will turn (temporarily) red, and may burn a little. This usually goes away, but if it starts to burn badly, wash it off.
However, the products you mentioned using should be fine though! Just make sure to moisturize. And if you find your skin is very tight or dry, try the Drops of Youth bouncy mask, or something more replenishing. Remember, the tea tree line is targeted for blemishes, so it's meant to be more drying.
Are you a The Body Shop employee? No