Reducing the number of channels grabbed?

Hi,
I am using the following version of the UK RT grabber:
====================================================
+ tv_grab_uk_rt
Channel selection: Lineup

Program/library version information:

XMLTV library version: 0.5.63
tv_grab_uk_rt version: 1.28, 2012/06/13 08:06:58
   libwww-perl version: 6.05


Source data last updated on: Thu, 16 Apr 2015 04:30:01 GMT

Retrieving channels: 100% 
[==============================================================================================]D 
0h00m00s


The Radio Times has usable data available for 335 channels which we
can use to generate TV listings for regular and some timeshifted
channels. The tv_grab_uk_rt software also has support for an additional
77 timeshifted, 8 part-time, and 5 part-time timeshifted channels
based on the Radio Times data.

In total, tv_grab_uk_rt currently supports 471 channels.

====================================================

Its currently grabbing far more channels than I need. How can I reduce 
the channels grabbed? A friendly pointer
to where it is documented would also do fine. I tried editing various 
files, but it didn't work.

Using the older version I knew how to do it, but I'm somewhat lost in 
this version.

Cheers Brian




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