Estimated costs to businesses from re-pricing products are published in the impact assessment of changes to the standard rate of VAT. This is available on the HM Treasury website.
HMRC sent a summary guide on dealing with the temporary reduction in the VAT rate to all 2 million VAT registered businesses immediately after pre-Budget report 2008. More detailed guidance was produced and published on the HMRC website. Additional staff were made available in the National Advice Service to answer questions on the rate change. A full evaluation of all the associated costs is not readily available.