OK - thanks Gail,
so thats...
1. DBCC CHECKDB
2. DBCC CHECKCATALOG
3. CHECKDB WITH DATA PURITY (Ola Hallengren's SQL Server Integrity Check)
4. UPDATE ALL STATISTICS (Ola Hallengren's SQL Server Index & Statistics Maintenance)
5. DBCC UPDATEUSAGE
No.1 and No.3 seem to be duplicating - could I get away with just running no. 3 first?
thanks,