Simultaneous Parallel departures are not permitted under ICAO unless the initial departure tracks diverge by 15 degrees immediately after take off.
...unless you get a waiver to use 10 degrees for noise abatement
The runways are about 2 miles apart.
The Manchester layout with runways staggered by a mile was designed to conform to the SOIR rules.
Runways on this side of the ocean are often not staggered at all (PHL excepted) and in VFR weather conditions (3SM+/>1000ft) takeoffs and landings occur side by side on runways that are 1000 feet apart centreline to centreline. Any missed approaches will be separated from departures visually and turned at least 30 degrees, but usually more. Departures would not be turned toward the arrival runway (other than what is published in the SID) until the controller determines there will be no conflict in the event of a missed approach. (EWR 22R departures turn left immediately about 30 degrees toward 22L then turn right again shortly after)
In IFR weather, the departure must be rolling before the arrival is 2 miles from touchdown or wait until it has landed. Separation in the event of a missed approach would still be a turn of the arriving aircraft to achieve 3 miles in less than a minute.