Seems a better deal than $10 welcome or survey voucher. Don't think we can combine $10 welcome / survey voucher with this, but welcome to try. Never used them before though, so can't comment about their service quality.
$15 OFF CLOTHING ALTERATIONS*
*Must present e-voucher upon placement of order. One voucher per person.
*Not valid with any other offer, dry cleaning, embroidery or invisible mending.
*Valid until the 24th December 2015
Promotion Code: Christmas15
Enjoy !
Can't find any indication of what the prices are… not really a bargain if the $15 off brings an alteration down to $50 when other places already do it for $30 etc…