For example, your contribution is £100.00 per month the Government will give you £20.00 towards your pension. What your pension advisors may say is that all you need to pay is £80.00 per month. They will then claim £20.00 from the Government; hence total contribution is £100.00 per month.
Bearing in mind this a Money Purchase investments plan, the more you invest long term the more likely to get a greater pension. The gross contribution should £120.00 and not £100.00 per month. (Pension Calculator)
Legislation
HM Revenue & Customs practice, all of which are liable to change without notice. The impact of taxation (and any tax relief’s) depends on individual circumstances.
Consolidation other debts
If you have a number of loans that charge high interest rates; a car loan at 18 percent, perhaps or credit card debt at 29 percent, then paying off these loans by increasing the amount of your mortgage is worth considering. You could save money because mortgage interest rates are lower. To make this work properly, you'll need to increase your mortgage repayments to keep the date you will pay off your mortgage the same. Preferably, you will make your repayments the same as the total repayments that you were making on all your loans
Borrowing against your mortgage to pay for luxuries like holiday will just make the cost you may be considering using paying a credit card interest rate of 22 percent or a hire purchase rate even higher.