~140cm tall, growing against wall close to bridge over Olchon brook
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This is surely toadflax with spurred irregular flowers, with a 2 lobed swelling on the lower lip of the corolla - evident in the pics. Also alternate leaves.
Loosestrife is a very different plant with opposite leaves and flowers in whorls, regular in shape with 6 much brighter reddish purple equal petals.
Lat/Lng: 51.9, -2.9
OS grid ref: SO4330