MySQL: How do I show the count of two tables in one query.

I have 2 queries below and I would like to join them to give a single result.

Table 1 has more postcodes than table 2 and I would like to list the super-set of all postcodes in the left hand column and if table 2 doesn't have a result for that particular postcode it would show zero.

Here is an example of the desired output.

Postcode    Count1    Count2
SW                200          57
LS                 400           0
PH                 250           23

etc...

Can you help?

SELECT `postcode`, COUNT( * ) AS Count1 FROM  `table1` GROUP BY  `postcode`;
SELECT `postcode`, COUNT( * ) AS Count2 FROM  `table2` GROUP BY  `postcode`;