Navigation errors or something else

Just recently we have seen an increase in rare birds hitting the East Anglian coast.  Last few days we've seen in Lowestoft and Gorleston-on-Sea 3 such visitors.  At this time these birds would normally be heading for Southern Spain, Turkey and then on to North Africa.  Has to be said these birds are Juvenile so has their nav systems become confused, or strong winds blown them over here or perhaps our unseasonally warm weather:

Desert Wheatear (male) Lowestoft

Desert Wheatear (Female) in Gorleston