• Gas Safety Check Wakefield
• Gas Safety Check Wallingford
• Gas Safety Check Wantage
• Gas Safety Check Warwickshire
• Gas Safety Check Wellesbourne
• Gas Safety Check Wellingborough
• Gas Safety Check Wendover
• Gas Safety Check West Auckland
• Gas Safety Check Wetherby
• Gas Safety Check Wheatley
• Gas Safety Check Whitby
• Gas Safety Check Willingham
• Gas Safety Check Willington (Durham)
• Gas Safety Check Wilton
• Gas Safety Check Winchcombe
• Gas Safety Check Wingate
• Gas Safety Check Winslow
• Gas Safety Check Withernsea
• Gas Safety Check Witney
• Gas Safety Check Wombwell
• Gas Safety Check Wooburn Green
• Gas Safety Check Woodnewton
• Gas Safety Check Woodstock
• Gas Safety Check Worcester
• Gas Safety Check Worcestershire
• Gas Safety Check Worksop
• Gas Safety Check Worthing
• Gas Safety Check Wotton-under-Edge