As joodles said above, Boots do a send-away process on 110 films - I've found Boots processing to be pretty good compared to typical high street labs, so if the films come back with a colour cast, it's likely that it's due to the age of the films - film keeps pretty well if stored in a cool dark place, though it is best to get films processed as soon as exposed.
I'd take one of the films in, and give it a try - warn them that it's an old film, and the last one's had a pink cast to them and the operator may be able to correct in printing. It's surprising what scope for altering colour balance there is even in a staight formward minilab machine.