>InterruptRoutine
>        Disable gie
>        Save w          (in usual way)
>        Save status     (in ususl way)
>        Save pclath     (in usual way)


>        Won't restoring pclath take us back to page 1, away from the next
line
>(restore status, enable gie, retfie)?


I am working with a 18C452 so I dont know much about program memory
paging...
But you are saving pclath inside your interrupt routine (page 0),  so I dont
understand why restoring pclath at the end of your interrupt routine will
take you back to page 1.

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