There are three possibilitites here Wilco as presumably having the funds to settle the agreement is not one.
Firstly, check whether you have early termination rights on the agreement. Dig out your paperwork and if there are any rights like this written into it, it will be near the section entitled "Reposession - your rights". If you have these rights then you can hand the car back as long as you have paid half of the total amount payable and have taken reasonable care of the goods.
If I'm honest, I can't see this being the case because Welcome charge so much for the goods and so much interest that they don't want half a massive debt and a car worth naff all to dispose of. I suspect you are on 'personal loan terms'.
Second option is to trade your car in for something way cheaper. Use your car as a lever against the settlement figure and see where you end up. Again, because of the price of goods and the interest rate, I suspect you will be in negative equity which will bump your payments back up to the level you are now.
Third is to keep the car and try to find something else in your life which is easier to cut the cost of.
Not the news you wanted to hear I suspect but this is the risk taken when taking out an agreement with companies like Welcome Car Finance.
Can you tell me the reg, mileage and model of your Focus - how long your agreement is for and how far into it you are...?
You gotta tie yourself to the mast my friend, and the storm will end.