Hi guys I live in the U.K. and would like to ask advice on which App I should be using in IOS to show where it is safe and unsafe to fly. I want to be as safe and resposible as possible, does anybody know which App is best to use, and the most comprehensive and informative? Thank in advance!

Have you seen this website - http://www.noflydrones.co.uk/

A bit more complex but more comprehensive perhaps:-

http://notaminfo.com/nationalmap

This is a good read as well, also gives time tables for expected low level training :-

https://www.gov.uk/low-flying-in-your-area

They don't usually fly at weekends unless exercises in progress.

Some good information here:- https://bmfa.org/Info/Model-Flying-Types/First-Person-View-FPV

And here :- https://bmfa.org/Multi-Rotors