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Just an update - when I logged onto the site yesterday before contacting them the prices had reverted to what I had paid the night before so whether the 50% reduction was a temporary blip, I don't know. However I still rang because I was miffed at being 'tricked' into booking what I thought was the last room.
I was told it was the last room with an inland view. There were sea view rooms available but I would need to pay the supplement of £56. I told them they should have made that clear instead of advertising it as last room remaining as I would have waited another week or so (for the prices to come down!) before booking. They wouldn't be swayed so I emailed a letter FAO the Chief Executive of the company and got a phone call back giving me a sea view room at no extra cost. Pleased with that although still feel a bit tricking into booking - lesson learnt.