Valuing 1960s(?) Dinky model?

[MGB Boy]

I recently remembered about an old model we had hidden away in the house.
It turns out to be a boxed Dinky Police Mini Cooper S No.250
The box is in good condition as is the model for its age. Its by no way mint condition few paint scuffs etc, Ariel is missing and it looks as if the rear number plate sticker has been pealed off at some stage.

I cant find much about it but seems to be around £40-50 worth.
Can anyone help me find it's actual value / suggest how I can get it valued?

I can upload pictures later if necessary

[delta037]

See ebay - completed listings mint boxed unsold at £9.99............... loads listed in current auctions from a fiver. Seems a shame but you might be better off hanging onto for a few more years. Fifties Dinkys are the investments.