UK261 flight disruption compensation
If your Ryanair flight departed from the UK or arrived in the UK on a UK/EU carrier and was delayed by 3+ hours, cancelled, or you were denied boarding, UK261 (retained EU Regulation 261/2004) may entitle you to fixed compensation: £220 for short-haul, £350 for medium-haul, or £520 for long-haul flights.
UK261 (retained EU Regulation 261/2004)