Grr, I wish this deal had been posted / started just a little bit earlier.
I missed out on booking the LHR-HEL-TLL for £232 at a suitable date (i.e. I don't want to go to Estonia in November) and instead had to settle for £280 in April, which I booked yesterday.
But I want to go London-Asia in May so if I had booked my TLL trip in May it would have fit nicely with this. Oh well it just means more TPs...