Loyalty discount only applies if you have a 12-month pass, and entitles you to a 10 % discount on your next 12-months pass. The pass must be renewed within 14 days, or the offer will expire. In case of a break, your loyalty discount is removed and you have to start again. The loyalty discount cannot be combined with any other discounts (but can be combined with the student rate).
The monthly cost is constant until you cancel your direct debit agreement. Therefore, the monthly cost will be unaffected by price increases.