Sorry for yet another hone question in such quick succession guys.
The kit I purchased elsewhere had a Norton flattening stone with it and I'm aware of issues relating to it's use and it needing regular lapping etc.
My question is whether the reverse side could be used as a dedicated waterstone in itself (once lapped of course), for working on very dull knives or repairing damaged razor edges?
I'm presuming that it's grit size is similar to the more expensive of the two Naniwa Lapping Plates (which is rated at 220 grit), given that they're designed to perform very similar jobs to each other.
Also, if the Norton isn't suitable then would the Naniwa be up for the task (I ask this as it's literally half the price of the equivalent 220 grit waterstone in the UK)?