Hi kim
You have 12 months to validate you visa, from the date on you medical.Say if your medical
was done on the 25 march and you had you visa on the 30 sept. you have to validate your
on the 25th march 2008.I f that makes much sence.
Also about weight they are not so bothered about being over/under weight providing you haven't got other issues eg high blood pressure,heart probs etc.
