Which football team is theoretically entitled to enter both the FA Cup and the Welsh Cup as their stadium is half in England and half in Wales?

The Deva Stadium is an association football stadium spanning the Wales–England border in the United Kingdom, that is the home of Chester F.C., the effective successor club to the liquidated Chester City F.C. The name Deva comes from the original Roman name for the fort Deva Victrix, which became the city of Chester, in North West England. The Deva Stadium replaced Sealand Road.

https://en.wikipedia.org/wiki/Deva_Stadium

I think it is Cardiff city. The stadium itself does not border England, but the team itself has competed in both FA and Welsh Cups.
Map of the stadium.
http://www.footiemap.com/multiclubcities.php?co=wales&season=2009-2010&map=cardiff&league=1&showing=

Wiki- Cardiff City Football Club is a Welsh professional football club based in Cardiff, Wales. The club is currently playing in the Football League Championship (Which means that they are relegated from the FA but can come back if they win the championship). It plays its home games at the Cardiff City Stadium.

Cardiff has won the FA Cup in 1927. They have also been regular winners of the Welsh Cup, and as the winner of the Cup in 1966–67.
https://en.wikipedia.org/wiki/Cardiff_City_FC

Cardiff also used to play at Ninian Park, but that also is located completely on Wales.
https://en.wikipedia.org/wiki/Ninian_Park

>> The England-Wales boundary runs right by Chester, and one
>> of the 'suburbs' (Saltney) is actually in Wales. The Bumper's
>> Lane trading estate is on the Sealand side of Chester

The border England-Wales runs through the stadium's ground, and crosses Bumper's Lane.

http://maps.google.com.au/maps?f=q&source=s_q&hl=en&q=Sovereign+Way,+Chester,+City+of+Chester+and+West+Cheshire+CH1+4,+United+Kingdom&sll=53.19125,-2.921376&sspn=0.019439,0.044889&ie=UTF8&cd=1&geocode=FX-mKwMdOmHT_w&split=0&hq=&hnear=Sovereign+Way,+Chester,+City+of+Chester+and+West+Cheshire+CH1+4,+United+Kingdom&ll=53.189399,-2.921505&spn=0.00972,0.022445&z=16