By Liam Gilliver Family finances can be tricky to manage, but one woman wants a share of her husband’s overtime pay to fund her facials and salon trips. Many couples choose to contribute equally to their outgoings, such as council tax, mortgages/rent, energy bills etc – while others choose to pro-rata payments based on their salary. Depending on who is the breadwinner, or who looks after the children full time, it can be difficult to agree exactly how the money is split. But one woman is certain she’s entitled to an extra £100 from her husband so she can treat herself. Her comments have sparke…