Using a comma before ", a further charge may apply..."

[ColgateSmile]

Hi

Could someone please tell me if the comma before 'a further charge...' is necessary?

"If we do not hear from you within fourteen days we will assume that you no longer wish to continue with treatment and should you wish to restart treatment at a later date, a further charge may apply (where applicable)."

I can't decide if the comma is required or not.

Many thanks

 

[Tdol]

I wouldn't use one there unless I put one before should.