A CONSORT compliant single-blinded, parallel-groups, randomised controlled trial design will be used to examine the efficacy of internet-delivered interventions for depression and anxiety disorders against a waiting list control group. To be eligible participants will be screened and will need to score ≥ 9 on the PHQ-9 and / or ≥ 8 on the GAD-7. To establish a formal diagnosis of depression or anxiety, eligible participants will complete the M.I.N.I. neuropsychiatric interview and thereafter will be randomised to either an immediate treatment group or a waiting list group. Randomisation will follow a 2:1 ratio. The immediate treatment will complete a M.I.N.I. neuropsychiatric interview at 3-months follow-up from baseline. The treatment group will be followed up at 6-, 9- and 12-months post-treatment. The waiting list control group will be enrolled into the treatment once the immediate treatment group will have completed. The waiting list will complete baseline screening and research measures at baseline and similarly complete research measures at the end of the waiting period (8-weeks).