Axe,
i'll give u're recipe ago. it's got me bugged now this bhajis thing.
Chriswg,
i'm not sure on anything after this last go - i ended up below par. i am sure this was solely down to me trying the 2 stage cook and making a bit of hash - i overcooked.
LH Dipies, RH Chilli Prawn's (Dipey or Dipuraja is now well known by the family)

comment on the comparison:
i overcooked a tad in following the 2 stage cook for the 1st time. the bhajis were a tad hard on the outside. Dipies just lost out to Chilli Prawns solely down to an after taste which i put down to the dried methi (family like me are not overly keen and maybe i put a tad too much in).
i mixed the "opened up" bhajis after stage 1 cook with the left alone. i told no one that potato was in dipies. no one commented on either the potato or that some were softer inside than others. i too could tell no difference whatsoever.
the only general comment which i tend to agree with is that BIR bhajis don't really have that much flavour - it's the combination with the mint sauce that makes the dish. on that basis Chilli prawns were considered closer to BIR (less flavour and certainly a lot cheaper).
i'm in a bit of a conundrum as to the long marinade (~5hrs). in the past i've felt this works better than frying straight away. what i did find that the "extra" batter inside the bhajis as a result was very soft but not that brill in terms of the overall flavour (we like the onion not the batter). i'll try out Axe's recipe before making any final decision.
conclusion at the mo : stick with what i do already - cook once 160C and reheat in microwave. use only onion. cook as soon as the onions soften enough to make a ball.
ps i think i've signed up to Dipies utube site as i remain big fan.