Make the most of the better weather with this free Friends and Family trial railcard, that lasts two months. You need to have at least one child aged 5-15 with you to use it, but you’ll get 1/3 off adult fares and 60% off children’s fares, so it is well worth borrowing a child if you don’t have one. ;.)
Perhaps use it to visit some National trust properties. You can try using the code F14001 to get 25% of an annual membership. That makes it £73.50 for two adults and all the kids in the household.