Acceptable 4 series upgrades ? (401)

[Michael English]

Thankyou very much Dave, really appreciate your pictures & the advice. Am in the process of joining BOC, and have now taken delivery of a single line brake servo. The intermediary from whom I bought tells me that my front brakes are alfin drums, so I hope with a servo I won't feel the need to upgrade them again.
And I bought this car thinking I could jump in & drive ... oh well. Live & fail to learn!