Discount on Cycle Hire annual subscriptions

There’s a “Black Friday” offer on the cost of an annual subscription to the cycle hire scheme, offering a 25% discount.
The annual membership fee is usually £90, but with the discount, it works out at £67.50, or the equivalent of 18p per day to use the cycle hire bikes.
The annual subscription comes with a key (if you don’t already have one) that unlocks the bikes, and then you can cycle for free for up to 30 minutes before needing to redock the bike. You can