Jason

Thank you for your reply on this. Just to supplement what I mentioned here the weatherstrip I'm using is Fowong Adhesive Weather Stripping Foam Tape 6mm(W) x 3mm(T) Window Door Draught Excluder SoundProof Weather Strip Tape Seals for Gap Seal (fire retardant material) which I am thinking of applying as shown in the attached photo along the right hand side of the frame and along the top (it's the black tape next to the grey intumescent fire & smoke seal ). The gap between the door and the frame with this does become less than 3mm when attached. In terms of the angle it's applied in a similar position to the batwing type seals you sent here.