Reverse lights are available from sellers in the UK, just not (I guess) as Lotus parts. They're manufactured by Perei and are typically stocked by trailer supply companies. Search "Perei" on ebay.co.uk and you'll see there are a few listed now, for example.
If you go that route, note that clear lenses do not necessarily mean the lamps light up white -- read the specs carefully.
Edit: at the risk of taking this thread even farther off-topic, I have to say that I'm looking forward to the day when the Evora forum has a parts cross reference list going. I suspect there are lots of parts that are more easily available under other car manufacturers' part numbers or through wholesalers -- or even direct from the OEMs* -- than from Lotus. Maybe that'll happen when the forum starts to get more of a DIY bias down the road.
* I have heard this is true of ECUs, for example
Last edited by West-of-Hethel; 07-30-2019 at 11:59 AM.