I had a feeling you two would reply

I did have a look at the city centre stuff like RichardP1, and then realised that, the on map bulls eye (non city centre POI) are not the same, and you are probably right BabyMakingWeather, it is a function of the map DB.

Its a pity you can't assign a png per node in the .url file as each node has a descriptor eg :
125842388,305629333MOBILE:6347@30 |||||||1http://tpdhost/cgi/getfile?FILE=%2FENG%2FENG%5F4%2ECPR&START=36360_

Just a thought, could the getfile statment not get a different "file" (inc the different png icon) depending on node type, mobile, fixed, redlight etc?