decided I would buy a new power supply to see if this was the fault, and started to look at antec as they have a quality reputation.
looked at kelkoo savastore was cheapest for antec 350 watt smartpower mentioned above at £38.47 plus delivery.
Continued to have a look at their site and came upon this
SLK1650 Biege TAC Tower PC Case with 350 Watt PSU £41.92, so for around £4 more than the psu, was getting the same psu, a case which has an antec 120 mm exhaust fan fitted as standard (these are normally around £9!)
I ordered the case around 4.30 yesterday afternoon £47.21 inc delivery, and it arrived at 3.20 pm today in the north east of scotland. impressive service from savastore/watfor - I will use them again.
The case looks very good quality, if maybe not the best looking in the world, but it looks OK. Power cable and all fitings supplied with a novel ducting scheme with a fan on the side (if you want) to blow cool air directly onto the cpu cooler.
So hope to try it out tonight, will post results - hopefully not a duff motherboard!