Can anyone recommend a good battery for my 6n2 petrol.

Don't know if it's any good as such but I did a bit of research when I bought mine last year (after I decided the 16 year old original battery had done it's duty) and settled on the Bosch S4 Silver range as being a good compromise between cost and performance.  Make sure you measure your original battery dimensions and check the type of terminals though - they differ depending on the specific model of your car.

Cheers for the reply I was thinking Bosch.

varta are good too