Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
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Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
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Hello, My first idea is that you should move this question to the MG forum section of this web site. There are plenty of MG people there.
But I can give a few things to look at since I have worked on many MGs. On the B's the connectors under the dash sometimes get disturbed and lose connection so make sure they are well seated. Also if you separated any of the connectors especially some under the dash then check them again because the plug configurations are so close that they can be intermixed. look closely at the wire colours to make sure you are putting the right plug to the right connector. Since you changed your master cylinders it is possible that you loosened some connections or reconnected them wrong. Go luck and talk to the boys and girls on the MG forum. Just hit forum buttom and scroll down.
But I can give a few things to look at since I have worked on many MGs. On the B's the connectors under the dash sometimes get disturbed and lose connection so make sure they are well seated. Also if you separated any of the connectors especially some under the dash then check them again because the plug configurations are so close that they can be intermixed. look closely at the wire colours to make sure you are putting the right plug to the right connector. Since you changed your master cylinders it is possible that you loosened some connections or reconnected them wrong. Go luck and talk to the boys and girls on the MG forum. Just hit forum buttom and scroll down.