The race to the coveted U.K. Christmas No. 1 is heating up as 1,500 combined units separate the top three singles at the midweek stage.

Ava Max’s “Sweet But Psycho” (Atlantic) takes top spot on the Official Singles Chart Update with 17,732 combined sales and streams, and a slender lead over its nearest rival, according to the Official Charts Company.

YouTube sensation LadBaby (Mark and Roxanne Hoyle) snags second place (16,754 units) with “We Built This City ...on Sausage Rolls” (Frtyfve) a fundraising parody of Starship’s 1985 hit “We Built This City,"

Profits from the Christmas release supports U.K. foodbank charity The Trussell Trust.

Meanwhile, Ariana Grande locks up third and fourth spots on the midweek survey with “Thank U, Next” (16,246 units via Republic) and her new release “Imagine” (12,922 sales), while Mariah Carey’s holidays classic “All I Want For Christmas Is You” (11,998 units via Columbia) completes the top 5.

Two more Christmas standards impact the top 10 at the halfway stage of the chart week, Wham’s “Last Christmas” (RCA) at No. 8 and The Pogues’ “Fairytale Of New York” (Warner Bros) featuring Kirsty MacColl at No. 9.

On the midweek albums tally, the Greatest Showman soundtrack holds onto top spot (24,888 units via Atlantic), ahead of Bruce Springsteen’s Springsteen On Broadway (23,094 units via Columbia) and Michael Bublé’s Love (21,419 units via Reprise).

The U.K.'s Christmas charts will be published late Friday, local time.