Again according to CCGB this is Cupro-Nickel (No silver) UNC/BU £10/£15, but going as a solid silver crown.
http://www.ebay.co.uk/itm/Solid-Silver-Crown-Superb-Condition-Fully-Boxed-Papers-1951-Festival-of-Britain-/381649944974?hash=item58dc1c018e:g:qsYAAOSwepZXRy7u
Looks like it's going to go for correct price.
Checking grading British Coins on this item http://www.ebay.co.uk/itm/272254892279?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
She has a curl at the end of her hair, the book show's no curls in F, VF or EF, is this normal?
According to CCGB this little beauty is listed at £10 for Fine, I may be new to this but the Obverse looks poor to me!!
http://www.ebay.co.uk/itm/QUEEN-VICTORIA-VERY-OLD-COIN-OF-QUARTER-FARTHING-1852-/301973834159?hash=item464f0b09af:g:cFgAAOSwuhhXUWRY