After 700 miles this weekend in all sorts of traffic and speeds I'm happy to report that the Philips T10 Ceralight LEDs that I fitted as sidelights are still working and don't appear to be affected by the heat off the h7 main beam. They're fitted alongside Osram nightbreakers which perform excellent as well.
Glad they work ok mate I bought a couple of cheap LEDs from eBay for ?3 and they seem to be working ok so far