Hi yes i used SVA Ltd in Southampton and unfortunately had bad experience.
If u have any bodykit on ur car when it arrives in uk.. they will have to remove it and put OEM bumper on it temporarily for SVA test (as everything must be standard to pass) - SVA when putting the aftermarket bumper back on ready for me to drive off forgot to fit it properly or attach the underbody trim to it.. so soon after on the motorway the plastic underside fell out and i came to v quick and dangerous stop in the middle of the M3 and had to get the police and the RAC to rescue me.
They also neglected to mention the rear spoiler was loose and if i drove over 70mph may fly off like a helicopter blade and end up in some poor buggers windscreen behind me..
Overall.. the extras i asked to be fitted (de-restricter, alarm, band expander, mph converter) was all done really well. But the checks on the body work was awful.. and dangerous!