i wouldnt send it recorded m8, aint worth the paper it written on, even royal mail will tell you that.
it only signd at the end and sometime not even signd, Send it special delivery, each person who take control of the letter has to sign for it, so it royal gurentee them.
The whole point of recorded is for the signature that way they cant say they didnt recieve it and you know the exact date they did recieve it i always send letters like this recorded worth it's wieght in gold especialy if companys have a time limit to comply to.