UK PAL tuner setup

[catdog]

I hope someone can advise me what I have missed out and how to get the UK TiVo to kick in PAL B/G!

I don't quite understand your problem. The script wont execute? I guess you could try:
dos2unix set_RFOutputChannel
chmod +x set_RFOutputChannel

(the first removes any "dos" carriage returns which may exist if you created the file on a windows machine or if ftp was in ascii mode, the second makes sure the file is executable).

I assume you also copied the i2c binary file to the tivo?