Did Giles feel guilty in Autum Term?

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We never find out what Giles felt about Nicola running away to Port Wade in Autumn Term. From Nicola's point of view, he was aloof, annoyed (or even furious) with her, and Nicola seemed to think that was fair enough and that it was her own fault.

But on the other hand, Nicola was 12 and at school for the first time, and I reckon was always likely to take him seriously. Did Giles have any feelings that perhaps it was his fault? That he'd behaved irresponsibly?

He doesn't appear again until Run Away Home, two+ years later, by which time it's all been forgotten. Has anyone any ideas what might have happened in the meantime?