Water volumes for Hobson's Town Crier clone

[Mufflewell]

I had a go at the Town Crier clone recipe but from the recipe information (batch size 22.73) how do I know how much mashing water to use (I used 15L), and also how much should I collect during sparging (I assumed 25L)?

I use a Ritchie boiler for mashing and boiling.

The recipe also states how long the hops should be boiled for. Does this assume a total boil time of one hour, or until the volume evaporates to the batch size?
Thanks, Tim

[Mufflewell]

Aha, I can see clearly now the protein has gone....thanks very much indeed.