H.T. oven wiring diagram question

I believe that is correct. Although as you indicated, the Power LED is redundant, since the PID display will be on when the main power is on.
 
I use a 230V LED in parallel with the elements for heat. The DC output from most controllers is usually very limited and it's maybe a bit optimistic to ask it to handle both SSRs plus the LED.

On my AutomationDirect Solo controller, the spec gives 40mA max DC pulse output and the Fotek SSRs are specced for 20 mA each.
 
A simple LED for an indicator draws about 10-15ma. My favourite 12v packaged LEDs are made by Corby. Last time I bought were about 1$ each.
 
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