u/Additional_Debt_8523

I have been training through mainland Europe for the passed month (2 month unlimited pass) and have had no issues booking seat reservations when need just by clicking the “check booking options” button at the bottom page. I’ve just began to book my trains for the UK and it just brings me to some information page (attached) instead of the actually booking options. Most of the trains I’m taking have either required seat reservations or recommended seat reservations and I’m wondering how to get around this and book a seat. Thanks in advance.