Discount will apply automatically. The offer ends on the 28th of January. MOD: TID page has been updated with the correct end date.
Cashrewards also have a 12% reward on TID at the moment, but I'm not sure if it will let you use both discounts because they both work by following a unique link. I would try activating cashrewards first and then follow the 19% off link.
I have used TID once but I did not need to make a claim so can't comment on how good they are in that regard.
I have been getting their emails for about a year and this is the highest discount I have seen (normally around 10-15%).
Also if you purchase a policy in January you go in the draw to win $1,000 drawn each week.
Discount applies to base premium only. Additional options such as specified items cannot be discounted. These options or cover which can be purchased for an additional premium includes extra cover for specified items, increased cover for rental vehicle excess, removing the policy excess and charitable donations made.
Used these guys a few times but never had to make a claim. Need to get another policy for a trip this year and noticed an influx of bad reviews over the past year seems some changes not for the better have been going on.