It is straight strung and has an over damped action. The serial numbers for Spencer pianos are listed on various websites and 48722 puts it between 1905 and 1910.
Unfortunately, Edwardian pianos are hard to sell at all in England, and fetch very little. Many are untuneable, or need major repairs, especially if the tuning pins are not holding. Ideally, get a local tuner to look at it before you get involved.
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If you find old references or links on this site to pianogen.org, they should refer to pianohistory.info