I am having a problem getting security prices to update because of differences in ticker symbols. I am using the extension "Quotes and Exchange Rate updater" which seems to vary in how it wants the ticker.

For example, GSK goes in as LON:GSK. Naked Wines uses WINE

I have to keep trying different variations before i can get it to work and currently i cannot get a ticker that works for National Grid Plc on UK stock exchange - anyone any idea what ticker would work and any better way of getting this whole piece to work better?

Thanks