Negligence / unsuccessful residence visa application / adviser miscalculated appeal period & appeal dismissed for being out of time based on out of date IPT guide / complainant arranged meeting with Citizens Advice Bureau & requested file / adviser provided key documents / Immigration Advisers Licensing Act 2007, s442 / Code of Conduct 2014, cl1, cl26f / whether mistake could be made by competent, reasonable, prudent & diligent practitioner / mistake amounted to failure to exercise due diligence & care / isolated incident can still amount to a breach / reasonable for adviser to only provide key documents rather than full file given situation / carelessness or negligence not minor / prudent adviser would not have relied on hard copy IPT guide / correct period set out in INZ decision letter / prudent adviser would have consulted IPT website / complaint upheld.