From CHICHESTER, use A27: take middle lane(s) at both A2030 & M275 junctions so you're not filtered off into Portsmouth
From PORTSMOUTH, use M275:
take middle lane for SOUTHAMPTON at junction with M27
Leave M27 at Junction 7 (for HEDGE END / A334; don't be waylaid by SOUTHAMPTON (E.) signs at Jn. 8). Off roundabout (traffic-lights controlled) take 1st exit LEFT for SOUTHAMPTON, towards a large aerial with two red lights on top
Off roundabout at foot of aerial, take 4th exit RIGHT
(sign-posted SWAYTHLING / WEST END / A27)
2nd LEFT (after approx. 3/4-mile, sign-posted HAREFIELD with HGV-restriction symbol) into Cheriton Avenue, an almost continuously right-curving road, as far as T-junction, facing open wooded area with flats beyond
LEFT into Somerset Avenue. Over slight blind brow, then next RIGHT into Exford Avenue (with Exford Arms on corner)
Burnham Chase is 100 or so yards on LEFT. "The First" is at the top of the hill, on left, behind the "forest" of holly!!