1. With the USA and most of the EU Advance Passenger Information is given to the Spainish Gov by the airlines before they travel, does the same apply to GA? (apart from the flight plan)
No
2. Hand baggage restrictions on Gels, Pastes and Liquids, does the same apply to private flights in GA Aircraft?
Haven't had to deal with the UK 'security' fascists in a while, but generally, no.
sorry of these are silly question, but as this is the first long trip for me, i would want to make sure it's legal.
Not silly at all - just goes to show how cowed we have become in the face of totaliarism
In terms of items that may be prohibited from being taken through airport security, you will have to find out from the individual airports GA section if this will apply to you. I have been waved through at some of the biggest airports, and sent through the metal detectors and had shoes removed etc. at some of the smaller ones. Prepare an overnight bag that does not have any sharps, liquids and you should be fine.
And that's good advice !