I’m afraid it’s unlikely. If you had bought this as a package deal then you would be covered by the Package Travel Regulations (https://www.abta.com/tips-and-advice/is-my-holiday-protected/new-package-travel-regulations) which would enable you to have a refund for the whole thing. However, as you have bought them separately you don’t have the right to a cash refund here.
You could get in touch with the airline you were going to use, though, and see if they would move the flight or give you a voucher. Some of them are. It’s worth an ask anyway!