A month doesn't sound too long from our colonial friends, normally my parcels turn up around 2-6 weeks after posting (pretty much the same when going the other direction as well).
Your parcel could be sitting in customs though, depending on the value of the item you may have to pay an import tax AND a processing fee to get it released. HMRC will eventually notify you if they have it, but don't be surprised if it takes time - not sure if you can contact them, but should be some info online?
Or it might just be sitting with your local Post Office sorting centre so worth a call to them...
I'd also say get in contact with Nick from
CH - he posts on the N&R forum with regular product updates -
http://www.dakkadakka.com/dakkaforum/posts/list/120/431763.page. He should be able to give you some clarity on whether the parcel is tracked or what the resolution is if it goes missing.
Good luck, hope you get it soon - and post your finished pics of the
LR !!