DH, those things are exactly what avoidance is. This is the problem. As soon as you start saying what lawful avoidance which is legal is morally wrong you are get into the sticky mess Cameron is in over this issue.
So those who think they know what is evasion, what is morally repugnant but perfectly legal avoidance and morally find avoidance tell me which category you put these in:
Jane sells a dress a week on Ebay and is employed full time. She does not pay tax on her Ebay earnings.
Jim has always earned all the money in the family. He has £5000 in savings. He puts it all in his wife's name. She's never done a days' work in her life and isn't even much good at the housework. he dose this so that there is no tax on the building society interest.
Mary and Peter decide each will work to earn £9k a year and pay no tax rather than only Peter work and waste Mary's allowance.
Kerry puts the maximum into her ISA and pension as possible each year to save tax.
Jerry is getting on a bit. He does not want his chidlren to pay 40% inheritance tax on his estate worth £600k when he dies so he gives it to them when he turns 60. He dies when he is 72 and on such tax is payable as he lived 7 years after the gift.
Jenny Livingstone sells cushions. She buys them for £10 each and sells them for £11. She pays tax on £1. Jenny also employs her husband in the business and pays him £20000 a year. This ensures neither of them pay 40% tax.