The Dunnock or Hedge Sparrow is a frequent visitor to the garden and one that is usually more shy than say a Robin or Blackbird. However we were able to catch the following video (albeit a little poor in terms of quality) of a male and female foraging.
Note around 1:53 the male begins pecking at the females rear (her cloaca) which stimulates her (if successful) to eject competing males sperm. In this case the male is successful as can be seen at 2:16. Dunnocks are unusual in that they can fertilize a clutch of eggs with different fathers.
At 2:45/2:46 the pair mate, which only takes a fraction of a second, before continuing to forage.