in 1990 i had a bad training toss from newark 47 mls,waited until it was dark to lock up then stood up at top of the garden talking to another fancier,to my astonishment i had 3 pigeons fly straight up the allotments and land on my loft, we only noticed them because they were white pieds and the house lights stood them out.The rest came the next day but the 3 must have been flying at least 20 minutes in the dark,all 3 were berlange delbars.