Ok so first sunny day , decided to start on the garden jungle up until I saw the giant Ants literally around 3cms big their seems to be hundreds all busy doing their thing Anywho im guessing that their is a nest nearby gulp is their a way to tackle it at all I'm in the North West on the coast (UK) & my garden is humongous as it was part of a cemetery up until 1920 so I get all sorts of bugs Would be grateful for any tips/advice
look for the ant trail. the nest tend to be under slabs, or in the lawn or flowe bed. Or they could be close to the house in your foundations. Watch the worker ants and then follow the direction that they go in as they will be heading home to feed their queen.
If it is somewhere you can get to put a garden spade though it to break it open and then scatter the powder over and around it. If it is inaccessible then put the power all around it and the ants will walk it into the nest.