- 1975 DGP opened its Edinburgh depot
- 1976 DGP bought premises in Giffnock in the south side of Glasgow as its Calor Gas depot
- 1977 The Douglas Gillespie Pro Am golf championship was established, bringing together professional golfers, customers and celebrities for a unique golf championship
- 1978 DGP opened a third depot in Bellshill, Glasgow
- 1978 DGP opened a fourth depot in Manchester for Telemon Tires
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