June 16 (Reuters) - Seymour Whyte Ltd SWL.AX
* Vinci confirmed that it is seeking to progress potential control transaction on key indicative commercial terms agreed with seymour whyte
* Refers to non-binding and conditional proposal from vinci construction international network
* Vinci requested an extension to exclusivity period to agree a binding scheme implementation agreement on mutually acceptable terms
* Has agreed that exclusivity arrangements will remain in place until midnight AEST 23 June 2017 Source text for Eikon: Further company coverage: SWL.AX