If you want to use those lights then dispose of the small white connectors and replace with something like these: https://www.screwfix.com/p/greenbrook-20a-4-way-connector/176gv
Good idea. Thanks
There's a simpler, cheaper solution available to the manufacturer.
The cutouts are 80mm
Arr ok the ones I use are knightsbridge they require a 65mm cutout, was going to suggest you can change to these when yours eventually fail.
electricalsupermarket.com
These seem to be what you have, and the pictures do not show the connections, it does say UKCA but a very poor lumen per watt output at 70 for a non smart, non dimmable unit. But they are cheap at £20, if fitted in an enclosure they would be permitted, I think rather poor not to have an enclosure, even the connector to convert g5.3 to gu10 comes with a connector like this
but the adaptor cost more than your lights, 
so being so cheap what do you expect? As @flameport says these 
are likely the best option at £2.39 each, it means in the future are wiring done at ground level. however my wife bought a cheap outside integral lamp at £4 and I must admit it is the best of all my carriage lamps outside and I have 5 of them. The only down side assuming you buy proper connectors is if they fail you have a large hole in the ceiling larger than used with most MR16 equivalent down lights.
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