This bird was giving a rapid ratchet-like call. Formerly considered to be just one species, it is now split three ways with American birds divided into two species, T. pacificus and T. hiemalis. Within Eurasia, upwards of 28-29 subspecies are recognized. Genetic analysis suggests four different clades, possibly cryptic species within this group. Birds of the European mainland are the nominate race. Birds in Great Britain are darker, less rufous, and those in Iceland decidedly larger and longer-billed. This bird's song was much slower and more deliberate than either Winter or Pacific Wrens North America. One song I recorded in Scotland was much more abbreviated than that of these birds in the Netherlands. This species is the only member of the wren family Troglodytidae that ranges into Eurasia and Africa. All the other wrens are confined to the Americas. Canon SX50 HS PowerShot
References:
Boesman, P. (2016). Notes on the vocalizations of Northern Wren (Troglodytes troglodytes). HBW Alive Ornithological Note 283. In: Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from www.hbw.com/node/1251725 on 13 August 2018).
Kroodsma, D., Brewer, D., Christie, D.A. & Marks, J.S. (2018). Northern Wren (Troglodytes troglodytes). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/58150 on 13 August 2018).