Is the knowledge gained from a masters conversion course suitable for pursuing a PhD? I am looking for advice on applying for a Phd in Software Engineering/ Human-Computer Interaction. I am currently working as a software developer and interested in pursuing an academic career in Computing at university level. I have recently completed a Masters degree in Computing with a Pass last year, however I have a 2:1 undergraduate degree in Graphic Design. 

I feel that the subject knowledge I have only gained on my Masters may be less adequate compared to a 3 year undergraduate degree to pursue a Phd. Would my current knowledge and experience be suitable to apply for a Phd in Computing or would it be beneficial to undertake another/ specific course before applying?
I am in Psychology and not CS, but what we find is that students with a three year BSc are rarely competitive for a funded PhD and most must do a MSc course first in order to be competitive. We ran a MSc conversion course last year for the first time. These students faired better than undergrads, but not as well as the students on our straight MSc course. A number have continued on to the regular MSc course with the hopes of getting a funded PhD the next year. I think you would probably need a distinction on a conversion course in order to be really competitive for a PhD. That said, you can always apply and see what happens. Some places might offer you a 1+3 type program.