Concatenate cells in column range if condition is met

Hi Guys,

Hope you can help. I'm looking for a VBA macro that can solve my problem.

I want the macro to go down column C and column D looking for a match with the row below and the row below that etc. and then concatenate column E in to column F. That's the easy bit. The tricky bit is concatenating column E of all the column C and column D matches into the first row of the first match. Hope that makes sense. If there is not a match with the row below concatenate column C and column D into column F.
Alex V

A	B	C	D	E
USA	1 scott st	Acme Company 1	Service Type 1	Sub service 432
France	1 scott st	Acme Company 1	Service Type 1	Sub service 123
Italy	2 scott st	Acme Company 2	Service Type 2	Sub service 321
Canada	2 scott st	Acme Company 2	Service Type 2	Sub service 453
Germany	2 scott st	Acme Company 2	Service Type 3	Sub service 476
Bolivia	3 scott st	Acme Company 3	Service Type 2	Sub service 766
Brazil	4 scott st	Acme Company 4	Service Type 3	Sub service 333
Brazil	4 scott st	Acme Company 4	Service Type 3	Sub service 367

Expected outcome:

A	B	C	D	E	F
USA	1 scott st	Acme Company 1	Service Type 1	Sub service 432	Sub service 432, Sub service 123
France	1 scott st	Acme Company 1	Service Type 1	Sub service 123
Italy	2 scott st	Acme Company 2	Service Type 2	Sub service 321	Sub service 321, Sub service 453
Canada	2 scott st	Acme Company 2	Service Type 2	Sub service 453
Germany	2 scott st	Acme Company 2	Service Type 3	Sub service 476	Sub service 476
Bolivia	3 scott st	Acme Company 3	Service Type 2	Sub service 766	Sub service 766
Brazil	4 scott st	Acme Company 4	Service Type 3	Sub service 333	Sub service 766, Sub service 333
Brazil	4 scott st	Acme Company 4	Service Type 3	Sub service 367