The 22.25 from Wembley Stadium is not now showing as an option - I wonder why. Actually looking at the arrivals/ departures from High Wycombe for tonight (for comparison) you only have 60 seconds to change services. Sorry to lead you up the garden path. I hope you get sorted
I see that now - I'm astonished that National Rail are confident enough to allow for a 2-minute transfer. However this may be a booked connection and the service will be held for your first-leg train. Ernest might have a view
Another option is 'Parkonmydrive'. I used this for Cardiff away and it worked superbly. Just had a look and parking near High Wycombe staion is just £5 all day. That's just one option but I wouldn't want to park too close to Wembley
Scroll down and you'll see you have two more departures to Birmingham such as:
a leisurely stroll to Wembley Central then:
2225 to H Wycombe
2302 HW to Birmingham Moor Street (arrive 0036)
To be honest I didnt realise Wembley Central was quite so far away. You can catch the next two services (22.10 and 22.18) and pick up a train from Clapham Junction. The first train leaving Victoria after 11pm requires a change to a bus at Burgess Hill. Those leaving later require a change at...
Just had a look - you'll have to get a shift on but here goes:
22.00 Wembley Central to Willesden Jct then
22.16 Willesden Jct to Clapham Jct (arr 22.36)
22.56 Clapham Jct - Brighton (train all the way with no change) arr. 23.49
As I said you'll have to get a shift on and hope the trains behave