Flight cancellation - Wizz Air

We apologize for any inconvenience caused by the flight cancellation. After a thorough investigation of your case, we can conclude that the flight was canceled due to extraordinary circumstances
Please kindly note, that we take all reasonable measures to operate flights while ensuring passengers’ safety and comfort, yet sometimes unexpected circumstances cause unavoidable disruptions.
The above referenced circumstances, as per the European Regulations 261/2004, fall into the category of Extraordinary Circumstances, therefore, we regret to inform you that no compensation is due.
“(14) As under the Montreal Convention, obligations on operating air carriers should be limited or excluded in cases where an event has been caused by extraordinary circumstances which could not have been avoided even if all reasonable measures had been taken. Such circumstances may, in particular, occur in cases of political instability, meteorological conditions incompatible with the operation of the flight concerned, security risks, unexpected flight safety shortcomings and strikes that affect the operation of an operating air carrier.”
in compliance with the European Regulation 261/2004:
“An operating air carrier shall not be obliged to pay compensation in accordance with Article 7, if it can prove that the cancellation is caused by extraordinary circumstances which could not have been avoided even if all reasonable measures had been taken."
Let me please draw your attention to the fact, that in accordance with EC Regulation 261/2004, we can reimburse the expenses, encountered directly due to the cancellation, such as meals, refreshments and communication charges (2 phone calls, e-mails, fax). As for the additional expenses, we kindly ask you to forward all related receipts, as an attachment to your reply, so that we can determine a possible compensation.
Should you have any further questions we will be delighted to answer them.

I would be grateful to receive any advise as I don't think this constitutes 'extraordinary circumstances'

Thank you in advance.

Some airlines and airports are members of alternate dispute resolution bodies (ADR). Some of these bodies have been approved by the CAA for providing a high standard of dispute resolution for consumer disputes stemming from a contract for aviation services; others will have been approved by other EU Member States.

If you have been dissatisfied with the response of an airline or airport to your complaint, you should be sent information on whether ADR is available in the airline/airport's final response. If you have not received a final response in eight or more weeks, you may also be able to refer your complaint to the ADR body directly - check below for whether your airline has agreed to participate in an ADR scheme, and for the contact details of the different CAA-approved ADR bodies.

Airline ADR schemes must handle the following types of complaints:

• Denied boarding, delay, or cancellation;
• Destruction, damage, loss, or delayed transportation of baggage;
• Destruction, damage, or loss of items worn or carried by the passenger;
• Problems faced by disabled passengers or passengers with reduced mobility when using air transport services (i.e. complaints about airlines arising under Regulation EC1107);
• and
• Any more general disputes arising where the consumer alleges that the business is not trading fairly. Here we are referring to situations where the consumer has been misled, for example into paying more for the flight or into buying something that they didn't actually want, where the consumer has been harmed by the use by the business of an unfair contract term, or where the consumer has been otherwise harmed by the breach by the business of general consumer protection law.