Pulled over and blew 48 roads side & 49 at police station

Hi. I was pulled on the 21st of January and I had blown 48 whilst in the back of the Police Car. I was then taken to the station and my lowest reading was 49.
I have a court case on the 7th of February. Now I have read a piece of information where if I blow in between 40 and 50 they should offer me the chance to either do a blood or urine test. I was not offered this at all whilst at the station.
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