I would like to get a Covid antibody test. I am aware that antibodies are only part of the picture and that t-cell response is also important, but I would like some indication of my response to the vaccine. They are not being offered by my GP or my hospital, so I will have to go private. I know that I need a test that measures the S (spike protein) antibody, but there are so many options (blood test / fingerprick, online / in person etc) and prices seem to range from about £50 - £200.
Any advice on which test to go for and which companies are reputable would be greatly appreciated.