I Found these via www2.eu-info.com/uk WALLIS DAVID C ELMCOURT ROAD, 33 SE27 9BX LONDON 02087667321

WALLIS DAVID G + CATHERINE C 2/8 BABINGTON ROAD, 113 SW16 6AN LONDON 02087691806 WALLIS DAVID J + LINDA E 3/8 CHINGFORD ROAD, 301 E17 5AD LONDON 02085316208 WALLIS DAVID W + ANGELA R 4/8 CROMWELL PLACE, 5 N6 5HR LONDON (N6 is Islington, isn't it?) 02083406135 WALLIS EMILY L + DAVID E + CHARLES E + JACQUELINE L 5/8 BIRKHALL ROAD, 11 SE6 1TF LONDON 02086983246

WALLIS HARRY G + DAVID G + MABEL L 6/8 RANDLESDOWN ROAD, 102 SE6 3SR LONDON 02086973475 WALLIS SADIE A + CHRISTINE L + DAVID S 7/8 EASTVIEW AVENUE, 20 SE18 2HT LONDON 02083170503 WALLIS SUSAN M + DAVID 8/8 SELBY ROAD, 3 W5 1LY LONDON 02089330667

These are all the Wallises listed on that in London.

Best of luck