Have put something on the CR site about Hollands and also Holland Bros of Orpington? Had a H Bros frame put a conversion on it a rode it as a Winter Barrow. Was told they were related. This was built for a London Transport bloke in the 70's. He still cycles. Now retired and restors & repairs Trams and Trolleybuses for one of our big transport museums. Its still with one of the VCC lads.
Best wishes and be lucky. Michael Butler Huntingdon UK.