OK, so had the Oric working fine, using scart adapter created on stripboard using schematic from here : Oric scart schematic , however after powering with 12v rather than 9v the ram chips appear to have blown, as per screen output and extremely hot ram chips (about 4 of them are suspect).
Step 1, replaced the power regulator in case this was faulty (checked with multimeter and was outputting about 4.7v – should be 5. Thermal compound. Ground soldered under PCB, need to tack a little on the top here as well. Testing – same RAM chips hot – 4.99V at the RAM though. Regulator heat sink very hot.