Which information notices can be appealed?
Schedule 36 Finance Act 2008 gives a right of appeal against most taxpayer information notices, on the grounds that the information or documents requested aren't reasonably required for checking your tax position, or that complying would be unduly onerous. The appeal goes to the First-tier Tribunal (Tax Chamber).
Two significant categories fall outside this right. First, notices requiring statutory records, the records you're legally required to keep anyway, generally can't be appealed on relevance grounds, since keeping them isn't optional. Second, notices the tribunal has already approved in advance can't be appealed again on the same point, because a tribunal has already tested the request.

