the ready meal market

[I'm a Chubby Baby]

Please correct this sentence, thanks.

When the demand for ready meals is high, apart from the/their? manufacturers, their/the? distributors and retailers also need to hire more workers to perform increased volumes of/an increasing volume? of work.

 

[Charlie Bernstein]

Please correct this sentence, thanks.

When the demand for ready meals is high, aside from the/their? manufacturers, their/the? distributors and retailers also need to hire more workers to perform increased volumes of/an increasing volume? of work.

It's all grammatical any way you write it.