Identifying Dawes 531 Super tourist

Looks like a Galaxy or Horizon, both were 531ST.
As said lower the stem to the max level arrow before you lose your face.
 
Pretty commonly sold. Depends how long you are willing to wait for a sale; though it's the right time of year. Anything from £150 to £300, if the right buyer comes along.
 
I thought the frame number was BS 6102 as in picture 3. Thanks for the advice.

The brake serial number is Shimano BR-AT50 if that helps as well

BS6102 is a British Standards specification for safety requirements for bicycles. BR-AT50 is the model number of the brakes and they were made from 1986 to 1993 according to Velobase - https://velobase.com/ViewComponent.aspx?ID=2B99F8D4-1D96-4F69-BD3F-45B38DD7B7B9

The frame number could be stamped underneath the bottom bracket.
 
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