As far as I know only occupational schemes of which you have been a member for less than two years can be liquidated in order to receive a refund of personal and AVC contributions only (i.e. not also employer contributions) subject to standard rate (?) tax. Otherwise I believe that the funds are locked away until retirement. There may be some other unusual circumstances (e.g. disability?) in which pension funds can be released prematurely but in general I think that they are locked away.