Looking at the blown S meter bulb in my R1000 I suddenly remembered that I had an old Scrap CB transceiver which I had bought for parts. That had a brightly lit s-meter. A few minutes later I had extracted the bulb, it looked almost identical to the R1000 bulb.
So this morning I removed the power board from the receiver and pulled out the old bulb. The wires are so thin it was difficult to solder the "new" bulb in but I managed it eventually. Here it is on the flying lead that connects to the power board.
And the proof that it works!- here is the R1000 with the meter illuminated
Of course the replacement bulb is I guess almost 30 years old. It will be interesting to see how it lasts. But for now at least my R1000 is back in full operation.