There's the Daventry triathlon that Rugby triathlon club, that's usually mid September although there is no date on their website for 2018 yet. I've done it for the past couple of years as my end of season race. It's well run and has the advantage of supporting a local club rather than an events company.
There are also some open water ones at Bosworth Water Park, On Your Marks Events run a race day in July but (personal opinion only) I don't think they are as well run as the others there which speedhub do, unfortunately I believe they are running theirs in early June this year so out of your date range (I have in the back of my mind that they might also be doing one in September, could be middle distance only though).
Others I know of are the BRAT and Pitsford races, never done them but people in the club speak highly of those...again could be out of your date range though.
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