(T) Two problems

Righty, been getting sucky economy out of my 1242 Sie recently. I took it in for its free fuel tank recall where the garage did nothing they say except check for signs of corrosion, it got the all clear etc. Since then i have only been getting 200miles to a tank with careful driving. The fuel injector light keeps popping up and the car lurches violently as it does so. Now i am taking it to a garage sometime to get the ECU read to see what fault code it is returning. Any ideas what it might be? I am thinking maybe lamda sensor problem. Prob with that is i'll need a new downpipe too as my sensor is welded into my downpipe. I didn't do it, was like that when i got the car.

Next problem, i just replaced my front disks and pads and they need running in so i took it out for a light drive. I stopped to check how hot the disks were, just out of curiosity and also cos i was bored checked the drums. The offside one was cooking! Having read the stickys i decided its the age old problem of a sticking cento handbrake. Prolly also wasn't helping the fuel economy. Thats easily fixable, what i am concerned about is the wheel bearing. How do i know if this is in need of repair?
I wanna try and get at least the brakes sorted before i make the journey to See-Red next weekend. Cos that will bugger the bearing up if its not already dead.

Ta

easiest way to check the wheel bearing is the raise the car and give the wheel a spin.. if it sounds gravely then its probably shot... if it sounds nice and smooth then ur ok... check that it doesnt wobble tho... mine rocked on the bearing a good few cm before i got round to replacing it