Thanks to all for the responses.
Absolutely I realise its an ongoing thing that I would have to make sure I am below through changing body shape/diet etc. for years to come.
29 I was told was for the interview through the agency I am dealing with (they said they wouldn't send me unless I am below that), but I below 30 was the number quoted for JCAB. Just wasn't sure if there was a skin fold test or something to back that up, but seems not unfortunately.
Only just recently lost my job due to the current circumstances last week, so no matter how hard it might be even with a slither of hope should the opportunity present itself I would be willing to make it work. Little bit hard to see how any recruitment would happening in this current environment, but nonetheless I shall press on.
Cheers and take care lads.