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Thanks for these replies...
The values of the opther houses in the area is the COMPLETED SALE price, not For Sale. I understand how Estate Agents all try and hype up the prices to make you go with them etc., have seen through all of that, but genuinely the value has not dropped £40k in the time I have owned it! I understand that this is possible in some areas, but this is not the case here.
I still do not understand why they have decided to re-value the property though, that is what has thrown and annoyed me?! If my housmeate had not wanted to move, they would be none the wiser, so I don't understand. They did not do this last year and it is not like we are trying to release any equity etc.