It's probably not relevant but I seem to recall my grandparents talking about an Arthur Hackett who I think might have serviced their cars. Whether he was in Cradley Heath where they lived I don't know.
Again probably not relevant, but I had an idea my Arthur Hackett's wife was called 'Trude. She ran a haberdashers shop on St Anne's Road, opposite what is, according to Streetview, Cradley Kawasaki. It looks like a block of maisonettes now but used to be a parade of redbrick shops, including a sweetshop, with a small pub on the corner of Compton Road opposite the Dudley & Dowell works. I was in that pub one morning (don't ask) and the barman was pulling pint after pint of Bank's Mild and stacking them on the bar, the hooter went, the men flooded across the road and, 15 minutes later when the hooter went again, they left a bar full of empty glasses.
I think this might be their marriage: Marriages Dec 1921 (>99%) Foster Gertrude Hackett Walsall 6b 1575 Hackett Arthur T Foster Walsall 6b 1575
1 May 1937 Holy Trinity Old Hill Graham WITHERS 20 B Farmer Short Cross Farm Halesowen Father George Withers Farmer Phoebe May HACKETT 24 S Press worker 26 Wrights Lane Father Josephus Hackett Miner Wit; Baron Withers / Josephus Hackett