Hi tech
As you have a good income, good savings, no accommodation costs and no dependents, you do not need capital security. You can handle the risk of short term volatility for long-term returns and lower risk.
A diversified investment in the stockmarket is the least risky and the most likely to provide you with a higher return. Investing as you are in deposits runs the real risk that your capital will be whittled away by inflation. While the value of an investment in the stockmarket will fluctuate, over the long term, it should outperform other asset classes, and deposits in particular.
In any event, you should also remain as flexible as possible. Although at 33, you may feel that you can predict your future, in reality, the future surprises people. Therefore, you should remain flexible and so you should not put money away in long term deposits.
Having said that, you probably should maximise your contributions to your pension fund. You will get tax relief on the way in, and although the Minister for Finance has created huge uncertainty over the future taxation of pension funds, I think it's still right for someone in your position on the top marginal tax rate to contribute the maximum amount. Of course, your pension fund should be 100% invested in equities.