Yes, tried them just yesterday. Goes straight to customer services. Prefer 0207 to 0800 as 0800 doesn't count towards my allocated minutes on mobile allowance.
I know this thread is older than my cat.
Got my attention with recent posts.
I always use an app weQ4u.
Not only does it work for sly but many other company's that like to charge you to contact them.
Ive saved over £30 using it.
(And it's free)