Mobile Response Unit. Portable Appliance Testing (PAT) Safety checks. PAT Testing is provided onsite and worked around the needs of your business. Flexible working hour may be available to reduce your downtime. Work carried out in accordance with the Code of Practice for In-service Inspection and Testing of Electrical Equipment (4th Edition) Certificate issued on completion of work. Please contact us for a free quote whether you have 1 or 500 items or more!!.