IMHO - Do not change your pass - Advance tickets are often not refundable or exchangeable and train specific. On the day prices in the UK if you miss a train can be eye-watering. In Spain it is similar - pre-bought advance low cost tickets are fixed to a train and on the day prices vary dramatically.
Your Global Pass is totally flexible and the only cost might be a lost reservation fee (In Spain).
All trains in the UK can be boarded without reservation so if you want to change your plans there is no problem with a Global Pass - it covers almost all trains in the UK. I do though advise you to get reservations for express trains - they guarantee a seat on busy trains avoiding standing or playing musical seats as passengers with reserved seats board at intermediate stations.
The myth of Spanish reservations worries me as just that - a myth.
Yes it can be worrying that you have to wait till you get to Spain but Renfe operates regular high speed trains between the main cities and a decent mid range and regional service. So as long as you are willing to be a little flexible you will always be able to get from A to B either at your chosen time or on another train soon before or after, Obviously there will be exceptional times when an event fills the trains but that is a simple piece of research.
While Spain is an absolute joke for passholder reservations, the UK is easy and free, UK trains don’t require reservations but you can get them at no cost by registering an account at www.gwr.com (one of the UK train companies) and using the Bookings-Seat Reservation option.
It may well be better for you to refund the pass and buy regular tickets. I am not sure what booking fees you are seeing for regular tickets as well as the price and time changes, what websites are you using?
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