Plotting Grid References online from and to maps

Here are some helpful websites:-
http://www.wildlifeinformation.co.uk/recording_gagr.php

http://wtp2.appspot.com/wheresthepath.htm 
Where's the path - can plot route and see heights. give Grid Ref and Longitude and Lattidude

http://www.gridref.org.uk/ can give postcode

http://gridreferencefinder.com/# UK Grid reference finder. OK

http://bit.ly/eTLU8Z Grab a Grid reference - Duo - Two maps together - OS map and arial

http://www.nearby.org.uk/

http://gb.mapometer.com - Mapometer - plot the route of your walk.