How high and fast did German bombers fly during the Blitz?

Hi, I was curious how high and how fast German bombers flew during the night-time bombing raids of the Blitz. In particular, how high and fast would they be flying the moment they released their bombs?

According to Denis Richards Royal Air Force 1939-1945 Vol. 1 p.201, British searchlights could not illuminate effectively above 12,000ft, and when searchlight-aided fightersscored serveral successes the Germans began operating 'well above that height' - but it doesnt say how high they would fly.

It is suggested on p.201 that they might fly at 20,000ft and 300 miles an hour - but this is not explicitly stated.

Any help would be most appreciated.

Cheers

 

APPENDIX 3. Operational Orders of I Air Corps
Operational Orders of I Air Corps for the first attack on London, September 7, 1940 From G.O.C. I Air Corps Corps HQ 6.9.40Ia Br.B.Nr. 10285 g.Kdos. N.f.K.

http://ibiblio.org/hyperwar/ETO/BOB/BoB-German/BoB-German-A.html#a3

No mention of speed is given.

 

IIRC, the He-111 cruised at 190-200mph.

The Ju-88A-1 with a 2,000lb bomb load cruised at 258mph with a range of 550 miles, and with a 3,800lb bomb load speed dropped to 190mph wit a radius of 250 miles.
page 6 at http://ibiblio.org/hyperwar/ETO/BOB/BoB-German/index.html

 

Takao thank you for this information. In case of interest I used this info to write this paper (first author) - in particular, to model how bombs would have fallen if dropped at random instead of 'aimed'. billion pound drop: the Blitz and agglomeration economies in London