I don't know the Spanish AIP/rules etc. but I wouldn't be turning anyone for base etc inside the standard IAP intercept points unless they have specifically declared "Visual".
If they report "ready for turning"; I would ask, confirm Visual before letting them turn in;' otherwise just continue vectors as you originally planned...
Where I used to work Noise Abatement was a significant issue, we couldn't let anyone over 5700Kg turn in, in specific areas of the approach despite the repeated requests... Pilots would report "visual" hoping for me to clear them to do their own thing, but I would just say "roger continue present heading, visual" etc.
Last edited by Blockla; 17th Nov 2009 at 18:06.