By the end of its existance, yes, alongside ECW and (up to its demise) Park Royal.
The Spectra is not just a development of the Roe bodywork, but rather more a modified ECW Olympian coach bodywork (aka Citybus C102-5). In any case, both the Roe and ECW bodywork originated from the same line of designate - that from the Titan.
Park Royal Roe早年其實係同一間公司
有次見過一張車廂水牌相係呢間公司名搭旋風利蘭logo
Charles H. Roe was taken over by Park Royal in late 1940s according to Wikipedia (actual date conflicted between sources) to form Associated Commercial Vehicles Ltd. (ACV). The merged company was then snapped up by Leyland Motors in 1962, before Leyland was itself nationalised in the 1975.