Eastern National's Old Harlow depot, taken over in the 1960s(?) with the operations of a local independent, survived into the early NBC era and was then occupied by a local coach operator - Old Harlow only ever accommodated two/three of coaches, with a couple more parked on a nearby car park as demand required (and if they were Lodekkas they wouldn't have been able to fit in the garage, which could only accommodate single decks).
So: Eastern National acquired its Old Harlow depot in 1962 with the take-over of Wright's Coaches, vacated the premises in 1976/7, which were subsequently occupied by coach operator Chris Earl(e) around 1979/80, and have since been demolished and replaced by a house.
And Nottingham City Transport's former Sherwood depot - closed when? - is now the base for community transport operator CT4N.
Are we including trams? The BET's Birmingham & Midland Tramways Joint Committee depot in Bilston was subsequently the home of Don Everall Travel, and then National Travel (Midlands) from 1974, when that company acquired the Don Everall coaching interests, then passing briefly to National Travel (West) in 1977(?) when the renamed National Travel (North West) acquired the western area of National Travel (Midlands), before closing (1977?) when National Travel (West) decided to transfer its operating interests in the West Midlands to Midland Red.
I'm pretty sure West Yorkshire's Edderthorpe Street depot, vacated when they moved to the newly-constructed Hammerton Street depot in 1928(?), was then used by another operator - only Hebble seems to fit, perhaps between moving out of JW North's premises and before construction of Park Lane depot.
And I'm sure there were some changes to Wallace Arnold premises in the Stanningley (Leeds) area. I'm vague on dates here, and currently redecorating, so have temporarily boxed my stuff away. But WA acquired premises in Stanningley with the acquisition of the Farsley Omnibus Co. Larger premises, on Richardshaw Lane (still standing, and in use as a climbing centre), came with the purchase of coach operator JW Kitchin (which was retained as a subsidiary), at which point the Farsley Omnibus operations moved to the Kitchin premises. In 1968 WA disposed of its Leeds-area stage carriage operations to Leeds City Transport and, with the Farsley Omnibus operations gone, the ex-Kitchin premises were felt to be too large and the JW Kitchin coach operations moved into the ex-Farsley Omnibus premises. Eventually, with the declive in local coaching, the Kitchin operations moved to share space in the WA/Feather Bros garage in Bradford.
Which reminds me - Leeds City Transport's first bus garage in Donisthorpe Street, Hunslet, which later became the bus central works until they moved up to the tram central works at Kirkstall Road (was this on closure of the tramways or as they declined?), was used by Wallace Arnold for a short period as their Leeds garage during the construction of their garage/coach station on Gelderd Road. Roughly on the same site, slum clearance and subsequent waves of redevelopment have changed the geography considerably is First Leeds City's Hunslet (formerly Hunslet Park) garage.
Part of the former Timpsons coach depot / yard at Catford was used by London Country South East / National London in the mid 1980s
Isn't that a continuation, rather than a closure and reopening? Timpsons becoming part of National Travel (South East), which was then reconstituted as National Travel (London), which was then put under the control of London Country, and then separated off with London Country (South East) - the premises being used by a continuation of successor operators until closed as part of a redevelopment scheme.
