Regarding the formal diet, you need to be on the exclusion diet for 8 weeks before attempting to reintroduce foods. This takes about one year to do properly. You will still experience unexplained flare ups. I would not suggest attempting the fodmap diet in the UK without speaking to a nutritionist first. You will need a go referral.
The AMT is the excess of the tentative minimum tax over the regular tax. Thus, the AMT is owed only if the tentative minimum tax is greater than the regular tax. The tentative minimum tax is figured separately from the regular tax. In general, compute the tentative minimum tax by:
What is VAT? Value Added Tax (VAT) is levied on the sale of goods or services by UK businesses. VAT is collected on behalf of HM Revenue & Customs by companies. A company pays VAT to HMRC by calculation the amount of VAT charged to customers minus any VAT they have paid on their own purchases. All goods and services are either VAT-rated or VAT-exempt.