This wheel's not right is it?

[Kell]

I think they would normally touch where they cross when laced up as in the picture I linked to above.

Have to say, the front wheel's spokes don't cross at all and I had real problems with that earlier in the year. Must have had about 20 spokes come loose all at one time.

 

[Pale Rider]

I thought it prevented the trailing spokes from going slack and then loosening at the nipple.

Aye, quite possibly, although the fine detail is beyond me.

The OP's bike shop may have messed up, but it may be they've found lacing the wheel the way they have increases reliability because the spokes need less tinkering with.

 

[Kell]

Well the shop's admitted they got it wrong.

While it's correct that a 2x lacing pattern on larger wheels is as mine was done, that's not how Brompton do it, nor what they recommend.

I'm a big believer in giving people a second chance and letting them correct their mistakes, so was happy to take it back there.

Should get a look at it tonight as my Dad's said he'll pick it up for me today.

 

[12boy]

A hand built wheel properly done should last a very long time with little truing. Even more so with a 346 wheel.