Guys i need some help/advice i sold my s1 about a month or so ago the new owner has just been intouch to let me know that the engine has blown

hes gutted im gutted for him as its so soon after i sold it on the car was serviced & set-up not that long ago not sure how he was driving it but it went great with me anyway the guy needs help to source a new engine the conrod came through the bottom end & through the sump head should be ok but where is the best place to pick up an new engine ? any help greatlly appreciated thank you guys

davie .
PS forgot to say the new owner lives near southampton if that helps for anyone nearby that can help him cheers