You could grab a pamphlet from the station on your way to London and fill it on the way. There are 10 “coupons” in each so handy if you want to visit many attractions in one trip. a big plus is that you don’t need to print anything
When i input the date of travel (going in june 2019 to London) it tells me the expiry date of the voucher i want is 02/01/2020 My date of travel is months before the expiry date but it wont let me download voucher. This happens on 50% of the attractions i need vouchers for. If i put in a different date, lets say a day before i travel then its fine and lets me book voucher but im worried if i dont put in the correct date of travel then maybe the voucher will be rejected at the attraction ?