OK, so 159 is back from its 10 day vacation at Palmer & Phillips. Most of the wiring loom traced and investigated, any cables routed over bodywork at sharp angles reseated and wrapped with further insulation and hey presto, no blown fuses!!
Seems though no major fault identified and 159 has started perfectly for almost 4 days now. No blown fuses when started with engine cold or hot, every accessory, all exterior lights, air con and radio either all on or off or a combination of these!
All very strange, but pleased to be mobile and seemingly working again. Have to admit my confidence in the car is somewhat dented. Keep expecting it to go 'pop' everytime I press the start button!
Big thanks to Chris and Ian at Palmer & Phillips - cheers guys!