Of course Tried again just now, test journey as follows:

Luton Airport Parkway 10:35 no platform

To be honest, how often is knowing the platform numbers any use at all for a
customer? I can't conceive of *not* confirming the platform from screens at
the time of departure. Knowing the plan in advance might be a marginal help
if there are separate entrances or separate carparks, for example, in which
case the knowledgable traveller might slightly improve the efficiency of his
or her access...(though, of course, the knowledgable traveller would have a
good idea of the platfrom anyway). Otherwise, what's the benefit?

[By contrast, knowing in advance which bus-stop you need in busy central
locations can be a great help.. ]

--
Walter Mann