Leaf problem help please

I’m a novice grower I’m just starting out too but I see your plant taking nutrients from itself, that’s what turns the leaf yellow, then dies off, solution find some plant food, I think it npk ratio, example 4-4-4 all purpose.
I also see a pest problem, research about mites and aphids, it’s little fucking bugs eating our plants they got me too, and how you know is this little white dots, that ain’t resen or thc my fellow cultivator, you got some homework to do before plants go bye-bye

Funnily enough this isn’t my first grow,just my first grow outdoors I wanted a challenge,I’m in the UK and this plant had just started flowering a week ago

It’s definitely a challenge outside because your at the elements disposal but, keep doing what you doing harvest time is upon us