This is not simple. The first �6K of savings (or �10K if living permanently in a care home) is ignored. Above that, an income of �1 p wk is assumed for every �500 or part of �500 savings. So if total savings were �8.5K income assumed would be �5 p wk. There is no upper limit on savings amount. These are current figures but I think they applied in 2003.
How much you would have to have saved to be denied Pension Credit depends on your other income (any pensions, work income etc,) and on what the guaranteed income applicable to your circumstances is. For a single person from Apl. 04 (I don't have an 03 figure) the normal guaranteed income was �105.45 p wk so if someone's other income was (say) �75.45 p wk they would have to have �30 p wk assumed income from savings to bring them above the guaranteed income. This gives a savings figure of �15K, plus the �6K ignored = �21K. This is only an example - various factors such as being one of a couple or being disabled affect the result, as do variations in other income.
The above all relates to guaranteed pension credit. There is also a savings credit which some people who are not entitled to the guaranteed credit can get but it is too complex to work out a theoretical example.