Previous backup time in column

SELECT bus.machine_name AS ServerName, sdb.Name AS DatabaseName,
COALESCE(CONVERT(DATETIME, MAX(bus.backup_finish_date)),'Backup Needed') AS NewBackUpTime,

		CASE
		WHEN type = 'D' THEN 'Database' 
		WHEN type = 'L' THEN 'Log File'
		WHEN type = 'I' THEN 'Differential'
		END AS BackupType,

busf.physical_device_name AS Location

FROM sys.databases sdb
	RIGHT OUTER JOIN msdb.dbo.backupset bus ON bus.database_name = sdb.name
	RIGHT OUTER JOIN msdb.dbo.backupmediafamily busf ON busf.media_set_id = bus.media_set_id
WHERE database_id > 4
	GROUP BY sdb.Name, bus.type, bus.machine_name, busf.physical_device_name
	ORDER BY bus.machine_name
GO

Above I have put my current code for checking if the databases have had a backup and at what time.

What I am trying to do now is get the old date and time record from the previous backup on the database. 

So for example I backed up advertureworks last night I want that datetime to be shown next to my newbackuptime column. I've looked in the msdb.dbo.backupset and can see the old record in there. How to I take that and make it a column, I was thinking maybe a DISTINCT but that would probably only result me in having the 1 result.

I may not have explained this correctly but if you need to know anything else feel free to ask.

Regards

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