Mine was change with the tank in the car, they carefully cut a piece out to make the hole above the tank big enough, then made a bigger blank, worked out much cheaper at the time. Would be even easier now I have no interior to speak of.
If anyone is interested I have all the original Lotus release notes for the MY2010 Lotus Exige Cup 260 which specifies everything the cup 260 had tweaked over standard.
Edit to say it doesn’t mention fuelbpump.
Tweeked over the standard 260? (Which will have the uprated pump) or a performance pack 240 or the standard S (220)?
Should clarify it is the full spec sheet and product specifications by Lotus released for the Cup 260. Tweaked was the wrong word.
the job can be done without taking out the tank
need to remove the seat and trim a bit 
Kind of what Sinclaires did with mine, just a bit neater 
F—in ell yours must be bad if that’s neater Ade…
no, mine is neater 
That don’t look too difficult, but I reckon, I’d still rather drop the tank.
Is it at all possible to get smallish hands in there, without cutting?
it is getting the pump out that is the problem not the size of your hands.
Weirdly, there has been an access plate above all the Elise chassis car’s fuel pumps, all of them too small to get the pump out of. When asking the Lotus field engineers why would you do that, the reason from the chassis guys was that a hole large enough to get the fuel pump out of compromises the chassis strength.
Who knows if this is the truth, but it seems weird not to make it larger, just to piss everyone off!!
As another little nugget of info on it, have seen a few side impacted cars where the top of the tank plate is deformed. Always right next to the fuel pump access hole.
Sounds plausible, hence why I’d rather just leave things intact and drop the tank without cutting, unless I could squeeze my hands in enough to remove it, which by the sounds of it, would not be an easy task.
Why would they not do a round hole? Seems odd to me it is oval anyway, always thought a round hole was better in terms of strength anyway?
S1 was round. Fitting the electric connector to the pump was painful, as who ever drew the hole in the chassis didn’t talk to the guy that drew the tank/pump very much. This lead to the fuel pipe fittings being offset to the side of the hole. And the electrical connector not under the hole, but under the chassis to one side 
There is a trick to it. But does tend to remove a large amount of skin. Small hands help. Which I don’t have 
I’m guessing the Toyota hole resolved this by making it slightly larger, to avoid chassis and fuel tank man having a bad day.
You can get the cap here…
http://www.reallylightstuff.com/engine/high-flow-fuel-pump-walbro-255/
Much quicker and easier to order one from here!!
You can also get the pump, new fuel filters, end cap and fittings as a complete kit
http://www.seriouslylotus.com/fuel-pump-upgrade-kit-toyota-cars
or the pump on its own
http://www.seriouslylotus.com/hi-flow-denso-fuel-pump-as-fitted-to-260-cup-etc
also the in tank filter on its own