hi TIm, welcoe to the board.
if your spanish is not up to par and you know nothing about the area, you may have to resort to a uk based estates agent who can help you deal with renting property.
you will pay more as they cater to those who can not do it on their own but with your lack of spanish, it may be your only option.+
there are hundreds of these estates agents all over uk and they are all online.
do a search on google and you will get a lot of results.
saludos,
jer...
p.d. just curious, if you know nothing about the soria area, why do you want to move there? or do you have to move there for work or something?