Here is a new release of pak128.Britain, which just contains the bugfixes of the last two years. Also double objects are removed, and thus this version can be used for network games.
Please find it here:
https://sourceforge.net/projects/simutrans/files/pak128.britain/pak128.Britain%20for%20120-3/pak128.Britain.1.18-120-3.zip/download
Excellent!