Fishing near Grantham

[toxictim]

Must admit im normally a summer fisherman. BUT, got to admit iv got that feeling that i need some fresh air some time soon. Iv got plenty of pike gear and a bit of know how although rusty. Where would you recommend in Lincolnshire for this sat. Dont really mind what type of fishing but as the forcast is cold and dry im thinking chub on the upper witham or pike on one of the lakes. Any advice??? Tim