Would through check work on that itinerary (particularly baggage)? AFAIK BA and EK no longer have an interline agreement. But Symesy9 will be initially checking in with QF, and the EK flight is a QF codeshare.
Checked EF for interline agreements from BA just now, and looks to be ok:
Paper Ticket and Baggage Interline Agreements
MAY ISSUE TICKETS INCLUDING
AA AC AE AF AH AI AM AS AT AV AY AZ A3 A9
BA BI BL BM BP BR BT BW B6 CA CI CM CX CZ
DL DT EC EI
EK ET EY FB FI FJ FM FV GA GF
GK GR G3 HA HG HM HP HX IB IC JC JJ JL JP
JQ JU JY J2 KA KC KE KK KL KM KP KQ KU KX
LA LG LH LI LM LO LP LR LX LY ME MH MI MN
MS MU MX NH NU NZ OA OK OM OS OU OZ PG PR
PS PW PX PZ QF QI QM QR RB RJ RO SA SB SK
SN SQ SS SU SV S7 TA TF TG TJ TK TM TN TP
TU T0 UA UK UL UP UU U0 U7 VN VS VY WB WF
WM WS WY XK XL XM X5 2K 3K 3U 4C 4M 4O 4Z
5T 7H 9B 9W
MAY CHECK BAGGAGE TO
AA AC AE AF AH AI AS AT AV AY AZ A3 A9 BA
BI BL BM BP BR BT BW B6 CA CI CM CX CZ DL
DT EC EI
EK ET EY FB FI FJ FM FV GA GF GK
G3 HA HG HM HP HX IB IC JC JJ JL JP JQ JU
JY J2 KA KC KE KK KL KM KP KQ KU KX LA LG
LH LI LM LO LP LR LX LY ME MI MN MS MU MX
NH NU NZ OA OK OM OS OU OZ PG PR PS PW PX
PZ QF QI QM QR RB RO SA SB SK SN SQ SU SV
S7 TA TG TJ TK TM TN TP TU T0 UA UK UP UU
U0 U7 VN VS VY WB WF WM WS WY XK XL XM X5
2K 3K 3U 4C 4M 4O 4Z 7H 9B 9W
Cheers,
Matt.