In recent years revenue from web advertising has reduced to a level which
makes it pointless to continue with. As a result we have taken the decision
to drop all advertising from the NSDK web sites including the Probert Encyclopaedia.
As you have discovered, The Probert Encyclopaedia provides a wealth of reliable
free information to people like yourself. But it costs a lot of money to
update and operate a web site like this. While we seek to cover our costs
through selling maps and images, the little revenue we receive through these
channels does not pay the cost of hosting the sites, let alone the costs of
operating the NSDK.
You can make a difference by donating just £1 towards our costs.
Click the button below to make a one-off donation of just £1 towards
the running costs of The Probert Encyclopaedia:
Or, if you wish to become a benefactor and make a larger donation, you can
make your donation through Paypal to