They said that no leisure flights will operate while the quarantine rules are in place. If its a high enough risk to require you to quarantine on return, then they wont let you fly for a holiday in the first place according to the travel expert that was interviewed this morning. So basically if the holiday goes ahead, the quarantine rules will have been removed anyway so you wont have to factor the extra 2 weeks in . If the quarantine is still in play when you're due to go on hol, then it will be cancelled. Its just a case of waiting to see when they lift travel restrictions unfortunately, so you probably wont know until much closer to the time if its going to go ahead, but if the only reason you're considering cancelling is due to having to quarantine on return, then that won't happen. Its probably best to wait for them to contact you so that you can either rearrange or request a full refund.