Right now Shimano’s R7000 is on sale on Chain Reaction Cycles for £500.
Edit: out of curiosity, I checked the prices for 105 Di2 and oh, my word! Even though it is also on sale, 20 % off, it costs a cool £ 1,400 — nearly 3 times as much as a R7000. Holy cow. Shimano has totally lost the plot IMHO. For reference, a SRAM 2x groupset (without cranks, chainrings and cassette) is on sale for £1,200. The Force crank is another £ 263, the cassette another 170. So essentially, Shimano is asking Force = Ultegra-type money for 105 Di2.