Although employers are not required to have an AED on site, a Risk Assessment should be completed to show this. You might find that there is a local public one which is accessible!
But where it is on site …
If a casualty is Not Breathing Normally and the AED can be got within a minute – leave the casualty and get it and use it straight away. If it is not, start CPR until someone else brings it or the Emergency Services arrive.
Employers need to complete a risk assessment and identify if any work practices could lead to a catastrophic injury, such as amputations. Training should then be given on the use of tourniquets at work.
Finding the correct position in the center of the chest a long with a good depth and correct speed is proven to help – but it MUST be effective. Yes you should still give ventilations if you have been trained and it is safe.