The Party Wall Act was extended to be country wide in 1997 and all and gives owners the right to execute works to a party wall.
What seems strange here is a party wall notice has been served with no supporting data. A typical notice should state what work is to be done and when it will be commenced.
Whilst your neighbour has commenced in the right manner in raising a notice it seems to be meaningless unless backed up with data about what the works will entail. I would suggest that you get your neighbour to visit the following web site
