Not sorted yet - not expecting much though.
There are reasons but they are boring and antithetical.
In theory my setup will have an under powered inverter, so will only ever generate 3.6kw/h despite significantly more panels. In practice they will be in different orientations so will peak at different times, so whilst I expect a little clipping on a cloudless summers day in most instances my wastage will be minor. Should I find myself at the clipping point regularly (very doubtful) I can jump through all the hoops for a G99 application* (>3.6kw inverter) but my main priority is generating enough to cover my daily load for as long as possible in winter.
As such I don't expect much return from exporting, a better tariff may have changed this.
* A G99 means application in advance of installation and no work can go ahead without authorisation of the local energy grid. This could be done in days, it could take months, and your hands are tied til then. Only costs a few hundred so if you have lots of time before the install I'd do it, assuming your array is over 5kw anyway, but if 3.6kw or under the G98 is notification only and can be done after the work, so no hold ups. In theory a G99 can come back with costs to upgrade the grid to handle your extra potential load, but thats unlikely in a residential situation.