I've checked a few different school holiday sites and this seems to fit with quite a few school holiday dates. You leave London Gatwick on the evening of Thursday 6th April and return back in the early hours of the 14th April.
In Majorca you will stay in Porto Petro, it's not your typical resort, but the reviews are positive and it is walking distances to beaches and the supermarket, and as I've included car hire you will also be able to get out and about and explore.https://www.tripadvisor.co.uk/Hotel_Review-g1010182-d573923-Reviews-Niu_d_Aus-Porto_Petro_Majorca_Balearic_Islands.html
6-13th April at Niu D'Aus £191.06 book at Alpharooms
Flights book at Norweigan £175.20
Book car hire at Ebookers £39.55