Im currently working out of the UK and in Singapore for a 12 month secondment (Oct 09 - Oct10). Should I be able to claim any tax back in April for Oct - April as I am out of the UK? I am still a UK resisent, paid into a UK account etc.
Short answer is no. You could claim a credit for an tax you paid to Singapore, but you will not establish non-residency which requires you being out of the UK for a complete tax year. Without non-residency very few legal ways of avoiding HMRC!