Well I bought the car only a few days ago so I haven't serviced it myself, there was no service history with the car but it does seem to have been taken care of.
I had a mechanic use one of the diagnostic cables, he said there was no errors showing perhaps because when I restarted the car after it stalled initially the ecu would have cleared any error codes from the stall - the mechanic suggested the coils as being the problem his reasoning was:
*the car was sat in traffic for quite a while which would have raised under bonnet temperatures, which may have exacerbated any problem with the coils which just so happened to be due for replacing anyway.
*the coils also had some dark lines/faint cracks in the casing as well as some black soot which wiped off(?)
*the car restarted and ran with no problem once the engine(coils) had a change to cool down.
I will post here in a week or so if the car hasn't had any further troubles, hopefully this might help someone in a similar situation.
P.S: The coilpacks were surprisingly cheap, due to there only being two of them, and they are the same part as used on older model v6 camrys.