Bob Eager brought next idea :
What I did was this:

a) Get the location of the transmitter (dtg.org.uk I think) and find it
on the OS map.
b) Find my house on the OS map.
c) get the bearing of the Tx from my house.

You forgot the correction for magnetic variation.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk