I'm in the process of buying one from WEX at Leeds, it's an L bracket from Leofoto. If you go on You Tube do a search and you'll see a video about it.
Let me give you some background as it's been a saga so far.
I saw this video about three or four weeks ago and responded to comment which asked when this would be available in the UK. The response from a Leofoto rep was that it was available now. I asked where and he responded with the UK based distributor.
I emailed the distributor and received a response that they were no longer the distributor for Leofoto products in the UK, they gave me the details of the new distributor:
Elite Optical Distribution Ltd in Exeter.
I emailed them and had a very useful email conversation with a guy called Elliott Howells who is the Account Manager. Their website also showed the L bracket on their list of Leofoto products (LPO-OM3). Elliott told me that they can't supply this to me direct as they don't do retail. He advised me to contact a camera shop and ask them to order this on my behalf. He suggested several and WEX at Leeds was my nearest.
I did this and I had an email conversation with the store manager there who was extremely helpful.
Nearly there: WEX went through their procurement process and finally the L bracket is now listed on their stock list (he told me) and I have one on order. The are now waiting for stock from Elite Optical.
Long story short WEX should have them soon (I hope)
Well I hope you get your grip/ l bracket- it looks like a great bit of kit for those that want an add on grip for their Om-3. Alas I am looking just for the L bracket without a bit of plastic/rubber/bood/metal that sticks out as a grip.
These grips are pretty easy to modify since they're typically aluminum.
I started with this:
Unscrewing the grip left this tab:
I cut it off somewhat roughly with a Dremel and a cutoff wheel, then sanded it down with a bench sander to get this: