From Uku, this seems to fit the occasional White-spotted Bluethroat that shows an orange spot (white hidden at the base of the feathers- interestingly partially visible in photo on right below).
Lots more on this subject here. – go on and click through!
You might find this bird interesting:
Cyanecula (White-spotted Bluethroat) used to be fairly common breeder in Estonian flooded meadow systems a few decades ago, but disappeared quickly. Nowadays it’s considered a very rare breeder and we were delighted when we found two territories in our home area Tartumaa. This morning (Friday 15th June, 2012) I managed to get photos of one of the birds and was surprised when the bird showed a reddish spot.
best regards, Uku Paal