I always recommend driving down the A1 - M11 and going into East London. Park somewhere on the Jubilee Line (Canning Town is good). This way you avoid all the M1 traffic, get a direct line into Wembley on the tube and you have no traffic getting away. Much more pleasant than driving on the M1 at anytime but particularly when half of Yorkshire and Lancashire are heading south!

harrow and wealdstone is only about 5-10 mins journey on the tube and plenty of parking i've heard

only 5 minutes off the M1 jct 4
449 parking places plus my space
Only £1 to park all day saturday
12 minutes on the tube to Wembley Park

I'm coming from the West so its Gerrards Cross for me and a train directly into Wembley Stadium Station itself.

Thats my prefered destination. Loads of street parking 5 mins away from the town centre.

Parking restrictions only apply in the week so ok to park all day on a Saturday.

Thats a great place to stop. If you are there early (ie 9am til about 10am) you can park at the tube station for a quid all day. Nice weatherspoons pub just up the road from the tube that serves big breakfasts at Northern prices.

It served us well when we were there this time last year

Enjoy your day down there and bring the trophy back to Yorkshire.