OP, first of all you should leave enough in your cash and saving accounts to face any potential emergency: broken boiler, car break down / replacement, redundancy, etc. There's no point in being mortgage free if you then don't have a rainy day fund.
@DoYouRememberTheInnMiranda . @BlissfullyIgnorant , gearing means leverage, ie debt. Debt increases your gains but also your losses.
Say you buy something (eg a house) for 100, then you sell it for 110. You have made a 10% gain.
Now imagine borrowing half and paying 2% interest: you invest 25, pay 1.5 of interest (=75 x 2%), sell it for 110, you have made a profit of 10 - 1.5 = 8.5, but you have made it over an investment of 25 , so your return is not 10% but 34% (=8.5 / 25) .
If instead you sell it for 90, your loss is not 10% but 46% (=-11.5 / 25)
So, if you have enough cash in the bank, should you buy with a mortgage or without? This is basically the same question as: should you repay your mortgage early if you can?
Well, it all comes down to what else you can do with that money.
Quite obviously, if you are paying interest at 3% on your debts, like a mortgage, it makes sense to invest any spare cash only if that investment yields more than 3%; if it doesn't, you're better off repaying your debts first.
Investments with a guaranteed return, like a saving account, will almost never yield more than the cost of a mortgage.
Riskier investments, like investing in the stock market, may, but there is no guarantee. In general, the longer your investment horizon, the greater the chances that happens.