USA visa?
 

Here's the problem . . . . . . . .. . . . . .
I have a 4x4 and we are travelling long term around the world.
We are entitled to enter (and have done) USA using the 90 day 'visa waiver program', but we need to stay longer.
Aparently we are not allowed to extend a 'visa waiver' entry.
My solution is i believe to enter Mexico and come back across border to get another 90 days.
BUT, aparently the official line is you cannot enter under the 'visa waiver' across a land border?
I have also heard on grapevine that British passports holders can request a 10 yr visa for USA?

I see 3 possible solutions and would very much appreciate advise from anyone with some knowledge of . . . . . . . . .

1) can i just cross from Mexico and get 90 day visa waiver ?

2) is 10 yr visa an option for brits? and if so where can i obtain?

3) is it possible to get a standard 6 month tourist visa from a US consulate in Mexico ?

As always, all and any help greatly appreciated.

Thanks guys.
Phil.