My DP was driving today with me and we came to a junction at a roundabout where the car in front pulled out then stopped my DP bumped into her . He then indicated to her if she wanted to drive further down the road away from the junction as he thought she would want to swap insurance details but she then sped off round the roundabout at speed . We were going same way and went down the dual carriageway where she’s saw us and veered off into another road without indicating at speed again . Our car is fine and hers looked to be but we don’t understand why she drove off when my DP would have been happy to give her his details he’s never had an accident in 16 years of driving . I didn’t get her her reg but she had a fairly unusual old car for roundabout our area . The whole thing was quite scary though