John R I don't know which company the Op works for but in the UK if your a mobile engineer you should be paid from the moment you start driving until the moment you stop this went through the court system a few years ago and us now law, sane with holiday time, if your sick on holiday by law the company has to give the time back.
Some companies will try it on with the we don't pay travel or you do the first 30 mins free (it's been tried with me and I walked), at the end of the day you jyst need to remind your manager what her can and can't do
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