I am entitled to a refund on cancelled flight booked through 3rd party

Life__Goes__On

MattJC
As you bought a package holiday (hotel & Flights) what Expedia are telling you  is complete rubbish. (Expedia has the most issues I've seen of late)
Under the Package Travel and Linked Travel Arrangements 2018
You are legally due a full cash refund within 14 days.
If Expedia keeps sticking to their nonsense and refuse to give you a full refund then go to your debit card company are tell them you want a Chargeback on that transaction.  

MattJC

appreciate the advice will call them and see what they say thanks

Life__Goes__On

NP  If you want further reading on a "Package Holiday" https://www.abta.com/tips-and-advice/is-my-holiday-protected/new-package-travel-regulations