Bletchley Park Cipher

The Bletchley park cipher is located on plaques of the walls of the buildings and huts in the courtyard at Bletchley park. The cipher-text below appears the same more than once. The cipher is an array of 11 by 16 letters and numbers totalling 176 alpha numeric characters.
<pre>HSKOQXRNUDB
UE6GHNPXKOE
P5BHKEODH42
BKUEDRBEOXO
XHDK94BNSHR
D4Q4AB46ONX
9BDEKXBRD8R
4DMON8AGPNQ
XEDRHGEOBU2
PNRBNSHDAEO
GRGKXONUKXH
FHBRE5K4NS8
ABXGKDRGOZH
4SKAQRB4KAR
KB6G94PRU8N
P5R4KA2B4N2</pre>
Frequency of the letters used is.
<pre>b : 15
r : 14
k : 14
n : 12
o : 11
h : 11
d : 11
e : 10
x : 10
g : 8
a : 7
p : 6
u : 6
s : 5
q : 4
z : 1
m : 1
f : 1</pre>
A very similar code appears on the backgroud image of the Bletchley park website also. However, the far right column and the last six rows are missing.
<pre>HSKOQXRNUD
UE6GHNPXKO
P5BHKEODH4
BKUEDRBEOX
XHDK94BNSH
D4Q4AB46ON
9BDEKXBRD8
4DMON8AGPN
XEDRHGEOBU
PNRBNSHDAE</pre>
 
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