I have already booked and payed for a tour for myself and my husband but need to change day and time to fit in with flight home. Is this possible. As I don't want to lose my money. Thank you
You have to ask directly
It depends how far in advance your booking needs to be - they are normally completely booked up, up to 6 weeks ahead. Selling your tickets will be no problem, but buying them might be!
visitors are limited for every hour. probably you can sale tickets as it is very popular place. I guess it will be possible only if you know somebody with whom you van change tickets, I worry :(
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