Yes you would.
If you were looking for an all in one product, there is a newish product on the market by Excel called all in one cubes (or something). You get four large cubes in a packet for about £7.50-8. You can buy this as an all in one, but check out the threads on here first, as the prevailing view seems to be
it's expensive
it gets eaten very quickly compared to the manufacturers claims of one per 48 hours per piggie
it doesn't seem to have enough hay in it for messing about in, nesting in and just having fun in
there are other concerns as well
I personally think it's great as a treat, but will continue to buy the excel blackcurrent and oregano nuggets, plus lots of hay. I prefer the long stemmed grass hay which piggies can pull out of hay racks, nest in etc etc, as this seems to have less waste than the chopped stuff. It also seems to have less dust than the chopped stuff. However, I'd try different types and come to your own conclusions.