Roast rib of beef and turkey crown best why to time cooking?

[katystar]

Hi I am cooking roast turkey crown - nigella style brined about 4-5kg and rib of beef 3kg Christmas Day aim to eat at 2pm can anyone help with timings as I can’t seem to figure it out (I think I’ve been looking at it all to long) beef needs to be rare any tips?

Found beef cooking times on Google; "rare rib of beef cooking times".
I actually googled turkey crown for myself the other day, as I've always cooked a whole bird before; they say do 20 minutes per kg, plus 70 minutes if under 4kg or plus 90 minutes if over.

Get a meat thermometer from amazon for £5. Well worth it.