Low flying planes reported in the UK and Poland tonight

The Flu Case Nov. 18, 2009

Reports are coming in of planes flying low tonight over Cracow in Poland also over Derby in the Peak District in the UK.
"We're getting info from our readers in England - there are several slow and low flying planes over Derby "working" for a quite long time (inf from 11;07PM), there is a high wind."

The Flu Case also received an email saying:

"There seems to be something going on in derby uk the last 2nights kept me awake last night low flying either helicopters or planes it is earlier tonight started 11ish and it was 3 till 5 am this morning ? we took a picture from our phone tonight i will get my husband to send it to you shortly. it is a helicopter tonight looking over the grounds with lights at first it looked like it was spraying with the tensity of the light .but i do hear another either plane or helicopter flying around its still going ´....ps close to our house at the moment," email from Derby resident.
"Also above Warsaw (now!) There is a report from near Okecie (Airport) that for 25 minutes large propeller plane is flying circles, The plane is quite low. There are no planes departing Okecie at this time. It is the first time our reader heard such a plane for for long time," email from Poland.