From your figures it looks like you currently have 5080 which will drop to 4780 a month. Your outgoings per month are totalling (if we make everything monthly rather than weekly) Outgoings of 3327 from the new total of 4780 leaves 1453 a month unaccounted for. Where is this money going? Start a spending diary to figure this out. I don't think you should add to your mortgage, I would be worried at the high incomes you have had and the fact the CU loans are there, 2 grand on your credit card and no savings mentioned, you pay things like insurance monthly which is usually more expensive. If you can identify the 1453 you can start whacking that off the CU loans and use shares then to clear them when you get close to parity. Heating seems a little high at 175 a month? Do you need two cars? If your partner loses their job you will be in trouble if you don't address those outgoings/loans.
Can you rent a room in your house? Can you sell one of the cars? Can you find parttime work?