Where can I find a list of all UK full postcodes including street name and their precise coordinates? They should be not like AB1, AB23 etc but AB1 2AA, AB23 5ZZ etc.>
The Royal Mail is the supplier of the 'official' Post Code database for the UK - they own the postcodes and postcode to GIS mapping. It's copyrighted and has some significant license fees.
Postzon is the product they sell to link the postcodes to the GIS co-ordinates.
There have been third party providers from outside europe who released details in the past for a fraction of the costs, but it's a very grey area, and you are then in consult a lawyer territory.