Lpc2000

I am having problems getting the I2C interrupt to work.  I have setup 
the VIC to enable the I2C interrupt (channel 9) in exactly the same 
way I have setup all the other interrupts (which work).

I can see that the SI bit is getting set correctly - and I can use 
the I2C interface by polling this - but the ISR is not executing.  

Does the I2C interrupt have to be enabled anywhere else or is setting 
up the VIC enough?  The UART requires an enable bit to be set also 
but I cannot find an equivalent for I2C.

The samples in the files section seem to also use polling.  Any help 
appreciated.

Thanks!