Hello

Note that the UK is not part of the Schengen area, so you will still need to check with the UKBA what are the requirements to enter UK considering your nationality and residence status in another EU country.

You need to check whether you meet the requirements for the residence card as the relative of an EU national application, as the fact that your father has a Spanish passport is not the only requirement; there are others. If you are over 18, you would have to prove you are his/her dependent and also prove you are both residing in Spain. However, you mention your father resides in the UK.

Feel free to drop us an email if you need to discuss your particular case in detail.

Regards,