This is a solid redemption for transatlantic business class, especially given the low fees. United partner awards to London often come with fuel surcharges in the hundreds of dollars, but this itinerary keeps out-of-pocket costs minimal at just $33.
For context, United typically prices business class awards to London in the 140,000-mile range through their dynamic pricing model. At 88,000 miles, you're saving over 50,000 miles—enough for a separate domestic round-trip.
One important caveat: there's only one seat available on this date. That makes this better suited for a solo traveler rather than families booking together. If you need multiple seats, it's worth searching surrounding dates to see if similar pricing pops up.
April is a pleasant time to visit London, with milder weather and fewer crowds than summer. Just note that April 30 falls on a Thursday, so you'd be arriving Friday morning UK time—a reasonable start to a long weekend or extended trip.
How to book
Search for award availability and book directly through United at: https://www.united.com/en/us/book-flight/united-awards/search