Rule 200
Choose an appropriate place to manoeuvre. If you need to turn your vehicle around, wait until you find a safe place. Try not to reverse or turn round in a busy road; find a quiet side road or drive round a block of side streets.
SteerTogether · Official English reference
Read rule 200
Using the road: rules 159–203
Work through moving off, overtaking, junctions, roundabouts, crossings and reversing safely.
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