Do not use this company!
Do not use this company under any circumstances. You will find the website constantly changes and refuses the offers. If you then make the mistake of phoning, the process is incredibly complicated, using phone, email and website simultaneously. I'm sorry to say this, but the person's accent was so strong that I had to keep asking them to repeat what they were saying. And then when the confirmation came through the date was wrong. I have never made a mistake like this when booking online so either it was a problem with their system, or else by then I was so bamboozled that I made the slip. I instantly spotted it and said no, that's wrong - and they wouldn't cancel it. I have lost a lot of money here. If a company cannot accommodate human error spotted instantly (if it was my error and I am not convinced it was) then they should be avoided at all costs.