Here's the contact details - found it by Googling... but I can#t say how accurate it is, but it's worth an email:
Cala Galdana Balearic Islands Minorca hotel Spain | Sol Gavilanes ... See contact details for the hotel. Tel: (34) 971 154545 - Fax: (34) 971 154546. E-mail:
[email protected].
It says though that they are closed for the low season so they may not be there at the moment.
Sqad will know better than I do, but IMO £45 taxi return for two to that part of the island looks pretty reasonable to me, on a par with what we paid from airport to resort last time we went to Menorca.