Hello, you should re-ask this question in the forum specific to the P38, you'll get more notice there. If you go to the main forum page you'll see the various categories.
That said, to start you'll want to replace the radiator. The common replacement is a Nissens 64319A radiator. The rover part number for a 2000 P38 radiator is PCC108080. It's a straight forward swap but I can't link you to the howto anymore because our forum owners f'ed up the forums.
We'd need pictures to comment on what's leaking at the front of the engine though.
That said, to start you'll want to replace the radiator. The common replacement is a Nissens 64319A radiator. The rover part number for a 2000 P38 radiator is PCC108080. It's a straight forward swap but I can't link you to the howto anymore because our forum owners f'ed up the forums.
We'd need pictures to comment on what's leaking at the front of the engine though.