Ian wrote in the comments for the Topfield tf4000t Ir code:

zero button on STB remote causes screen aspect ratio to change, so that when TiVo changes chanels the leading zero(s) cause the screen aspect to change. I considered two work arounds; set the number of digits sent to one, or corrupt the IR code for zero. I chose the second.

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How do i go about corrupting the zero code for the Topfield - is it edited in the tcl file then reloaded?

I nearly have everything working......

Ian do you still come in here?

Thanks, Kwijibot