It is stated in $\textit{Riemann’s Zeta Function}$ (H.M. Edwards) in the footnote of p126 that the average value of $\zeta(1/2+it)$ at Gram points is 2 - he cites Section 11.1 of the paper
ON VAN DER CORPUT'S METHOD AND THE ZETA-FUNCTION OF RIEMANN (IV), E. C. TITCHMARSH, The Quarterly Journal of Mathematics, Volume os-5, Issue 1, 1934, Pages 98–105, https://doi.org/10.1093/qmath/os-5.1.98
I have looked at this paper and there is no Section 11.1 and I do not see this result mentioned anywhere. Where can I find this result of Titchmarsh?