Yes, not very good design but equally not dangerous.
The Zs is higher than UK regs on OCPD alone but given your 32A C-curve trip range for 230V covers Zs = 1.1*230/(5*32) = 1.58 ohms best-case down to 0.8 * 0.95 * 230 / (10 * 32) = 0.54 ohms worst-case, your measured 0.83 is going to be met for over half the tolerance range, and the RCD side always met.
The Zs is higher than UK regs on OCPD alone but given your 32A C-curve trip range for 230V covers Zs = 1.1*230/(5*32) = 1.58 ohms best-case down to 0.8 * 0.95 * 230 / (10 * 32) = 0.54 ohms worst-case, your measured 0.83 is going to be met for over half the tolerance range, and the RCD side always met.