SQL Query Help

Hello

I have created the following Query in SQL which works:

SELECT PT.[Date]
	, PT.[Customer Reference]
	, PT.[Agent]
	, PT.[Contact Reason]
	, AC.[Total Records]
FROM
(SELECT e2util_dateandtime AS [Date]
	, e2sww_customerrefnumber AS [Customer Reference]
	, e2util_agentname AS [Agent]
	, e2util_contactreasonname AS [Contact Reason]
FROM dbo.Filterede2util_customercontact
WHERE e2util_dateandtime >= '29/08/2014'
	AND e2util_enquiryclassname = 'Customer Moves'
		AND e2util_origin = '354790000'
			AND e2util_directioncode = '0'
				AND (e2util_agentname = 'a'
					OR e2util_agentname = 'b'
					OR e2util_agentname = 'c')
						AND (e2sww_customerrefnumber LIKE '1%'
							OR e2sww_customerrefnumber LIKE '2%'
							OR e2sww_customerrefnumber LIKE '3%')) AS PT
INNER JOIN
(SELECT e2sww_customerrefnumber AS [Customer Reference]
	, SUM(1) AS [Total Records]
FROM dbo.Filterede2util_customercontact
WHERE e2util_dateandtime >= '29/08/2014'
		AND e2util_origin = '354790000'
			AND e2util_directioncode = '0'
GROUP BY e2sww_customerrefnumber) AS AC
ON
	PT.[Customer Reference] = AC.[Customer Reference]

This pulls back all Contacts in our Database that have been logged by a specific person. The final column then does a sum of all contacts that have the same reference number.

What I need is a sum of all contacts that have the same reference number that takes place after the Date and Time of the original contact in the first SELECT QUERY.

I have no idea how to achieve this. Any support?

Thanks

Matthew