Checking airhelp website for your flight says
Unfortunately, this flight is not eligible for compensation.
According to our flight data, one or more airports associated with your claim were affected by extraordinary events that impacted air traffic at the time of your flight disruption, such as runway closures or security threats. Airlines are not required to pay compensation for disruptions caused by circumstances such as these that are beyond their control.
If other agencies are happy to try and get the compensation for you, by all means it's worth a shot.
Irrespective of the reason for the delay, Ryanair still have duty of care, this should cover your r/t to London, presumably you went back home so no hotel/meals were involved?
Ryanair are not responsible for any cancellation fees you have incurred, this is entirely up to your travel insurance.