Aspen House stood in Temple Street in the town centre. It was built in the late 1960s/early 1970s and later demolished, starting in 2014. During its life it was home to the Swindon Registry Office and companies such as Lowndes Lambert (under its various name changes), British Telecom and others.
We have photographs of it being prepared for and then demolished, some of which can be seen at:
demolition.