I am a Gold European Exec Card holder (country of member ship is Russia)

Can I use a UK Travel Agent to book a MXP-HKG ticket an apply my (European) GUF2

I want to upgrade from J-F and there is even mileage availability but the stupid BA.com won't let me book it (the normal, "our systems are not responding error") on line.

I also presume that BA telesales don't count as a TA