Seroma and likely infection. Will antibiotics be enough to help this heal?

Unfortunately without pictures, micro biologic cultures of the supposed infected area, and an in person exam, it is very difficult to say whether you are actually infected or not.  That being said, your story is not an unusual one.Seroma fluid that breaks through an incision leaves a route of entry for bacteria.  Bodily fluids such as serum are an excellent culture medium for almost all gram positive and gram negative bacteria.  Once an infection has started, it is almost impossible to cure with a foreign body such as an implant in place.  Some of the finest physicians in the world are from London, England.  London has a history of dealing with bacterial infections that go all the way back to 1929 when Sir Alexander Fleming presented his Nobel Prize winning findings on the use of penicillin to kill bacteria.   At this point, I recommend you speak to your personal physician about possibly getting a consultation with an infectious disease specialist. 

If there is any hope of salvaging your implant in this scenario, it needs to be managed properly. You need to see a board certified plastic surgeon ASAP for evaluation and treatment.

I am very concerned you have a breast implant infection. I would need an exam to be sure, but it sounds like your implant needs to be removed. Please see a plastic surgeon in your area as soon as possible.