AcidVenus but I think it's important to narrow it down first and make sure I have a few in mind that tick all my boxes.
One piece if advice is to try to be precise in limiting your boxes to be ticked. In other words, for somebody shopping in the £500 range, it may be better to work (widen) up rather than (narrow) down. For better or worse, ES110 fits your price range. People shopping in this range often say “ i do not need all the bells and whistles, i only want X, Y & Z “ , but whether or not you want any particular bells or whistles, modern DPs, even in the 500 and under range, come with bells and whistles ….. it remains a revolving door mystery of sorts if any brand or model ever comes with all of them 😉 Example: do you require your new DP to support audio over USB? If yes, wipe all Kawai models off your list if candidates. If, however, you can accept running audio over an external USB setup, you might keep Kawai on your list.
At a minimum, Yamaha and Roland also have one ore more models in this range, and you might as well add some of the Casio models too. These (brands & models) competing in the 500-and-under range will be pretty easy to find just by searching on ES110 and competitors.