Just as a matter of interest in case any one is trying to find the ASR folder in the 'UK_and_ROI_880_3810' with 'Navcore 8.410.1218' 'it does not have a ASR folder' but does have 2 Speech files (cspeech_GBR.dat & cspeech_IRL.data) the 2 files are only a total of 20MB so I have left well alone (well whats 20MB between friends, besides which it works)
Whereas the 'Navcore 9.205' does contain a ASR folder but again the only 2 cspeech files would be the same as above in the map folder, so it may well be that the speech files in the UK... 3810 map have already been removed.
At least that is how the version that I have looks like, but many thanks for the tip as I have been meaning to ask the question what would happen if those files were removed, although in a different map but you have now answered that also.
(In the Europe map it would save something like 256+MB, but unfortunately still not quite enough to bring it below 2GB.)
All of the other Europe maps do contain quite a few cspeech files though.