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Photoshop 8 offers only 4 possibilities to compress if you want to save as TIFF:
- None
- LZW
- ZIP
- JPEG

I need a possibility to store the images as TIFF G3 using compression
CCITT G3, perhaps available using a plugin ?

I don't know any TIFF file format plugin, but other applications (e.g. Paint Shop Pro) let you save in CCITT TIFF format.

This can easily be done with the libtiff utilities (http://www.remotesensing.org/libtiff/), in particular tiffcp can recompress any TIFF with various codecs including TIFF G3 and G4.