In response to an earlier post...
VAT avoidance or planning in Jersey/Guernsey for low value imports (HMV/Tesco/Play etc) was blocked three years ago Apr 2012 by the UK Government. (VAT avoidance was no physical presence in Channel Islands just goods exported there, then reimported to UK; VAT planning was physical presence - staff and warehouse)
Tax planning in Luxembourg for downloaded music, films and books (Amazon/Apple etc) was closed under EU VAT legislation on 1 January 2015, and this was planned and known about from 2009 when the EU legislation was first published. Downloads in the EU are all taxed in the local country of purchase now. However, due to the massive impact to the Lux economy, the VAT benefits to the other EU countries are being phased over several years.
The OECD is doing a massive project on BEPS, (base erosion profit shifting), which is a global -not just UK -tax problem (Starbucks, Ebay, Amazon etc).
Although profit shifting for avoidance purposes doesn't sit well with me, I do agree with lower corporation tax rates as it makes the UK really competitive for global businesses locating here, creating jobs and opportunity for UK plc. Global or large businesses genuinely do have massive investment costs so it is right that they have tax relief for this - this isn't avoidance, but the media do like shock stories about some huge names not paying any corporation tax in the UK. They fail to mention that they've paid billions for expansion costs, replacement of infrastructure, technology costs or trading licences (Vodaphone & some other mobile phone companies) so it is completely right that no CT is due. Just another 'tax avoiding fatcat' for the masses to moan about.