Very new to high end audio - Recomendations

+1 on hifishark. You can filter for the UK.

A small integrated and a pair of small speakers may be found new for about £1000 and if you go used you can get better speakers. Some amps also include a dac but it may be worse than your dap. Or equal.

Marantz PM6007 may be for you. 

I just saw that Dynaudio has active speakers called Xeo 10. A bit over your price but you could look for sales.

What I don’t get is why would you have to look here? It’s not rocket science to assemble a nice system. I had/have a nice set up long before looking here...

Audio gear is just like high-end watches.

A watch may cost 40k and the other $400 or $4000

Yes, in both watches and HiFi, there is an enormous price range.
However, with watches, even $50-$100 can get you a quartz watch that keeps nearly perfect time. With HiFi, with respect to sound quality, there is no equivalent to the $100 Timex. In my opinion, you are unlikely to get a "high end" component audio system for £1000, even with used gear.

For that budget, if you’ve ruled out headphones (because sharing music with family and friends is the goal), have a look at some of the Sonos or Bluesound units. A single Bluesound Pulse 2i might work, or maybe a pair of the Bluesound Pulse Flex 2i units. Products like this can sound quite good. They take up little space,and are easy to set up and use. If you later invest in a more expensive component HiFi system, the Sonos/Bluesound units should be easy to integrate as satellites for a bedroom or kitchen.

For a little more, you might be able to find a pair of used, high-quality bookshelf speakers and a used integrated amp with WiFi built in. Maybe have a look at something like the Totem Dreamcatchers and a Bluesound Powernode.  The Totems might be ~$300+ USD used on eBay, the Power Node 2i about $700 new. 

death_block ... this may be the future to music consumption.  That is, a smart phone/ ipad/ laptop with powered speakers.  A concept that is largely rebuffed here but has high return for cost and at the end of the day sounds very, very good.  Check these guys out ... perhaps you can find some used.  Let us know!

https://www.elac.com/category/powered-speakers/

thanks for all the comments! What are your thoughts on paradigm monitor 5 floorstanding speakers?