The timing of the events are crucial to getting this right.
The process is set out here.
http://www.direct.gov...arylayoff/DG_10037790
You seem to be more interesting in getting away from the employment contract than getting your money - understandable if you've been messed around but you may eliminate your opportunity to get statutory redundancy.
As the weblink says, ACAS can help you with this.
Are you sure that your contractual notice period is only 1 week? - when did the employment contract start?