I'm a regular Thunderball player and just realised how to get 3 free lines each week.
Just read before voting cold...
I normally play 10 lines a week on the Thunderball, but just realised that if I play 14 lines, it will only cost £11.
The thing is, you win £3 if you match up the thunderball and there are only 14 Thunderballs to choose from, so assuming you play 14 different lines, all with Thunderballs ranging from 1-14, you will definitely win £3 back, therefore costing only £11.
So, for an extra pound each week, i'm getting 4 extra lines and a better chance of winning.
I know gambling isn't for everyone, but if you are a regular Thunderball player, its just a tip to get 3 free lines.