Waitrose has described suppliers as "the lifeblood of the supermarket industry" as it explained to The Grocer why it is the only supermarket chain to support the Groceries Code Adjudicator.

While Sainsbury's, Asda and The Co-op all made attempts to delay the establishment of the watchdog at BIS select committee hearings, which concluded this week, Waitrose gave ­evidence supporting it.

Waitrose said it had always had a long-term commitment to working "collaboratively" with suppliers, that it was "vital to offer them meaningful long-term support" and that the proposed enforcement of the GSCOP was "the best solution for suppliers" and "long overdue".

The establishment of the GCA has hit a series of delays since it was recommended in 2008. The draft bill closes for comments on 19 July.