Hi, I mainly only have experience of the upper/middle Loddon around Stanford End (near the Wellington Estate) and Carters Hill/Sindlesham which is either side of the M4. Essentially those stretches controlled by Farnham AS.
It's a small river and in places quite "wild" with little or no maintenance especially the upper river. Plenty of barbel up to mid teens, good chub to 6+ and some excellent trotting areas in winter for those prepared to walk a few fields! Otherwise most approach it with static tactics and at night for the barbel which often seem to be nocturnal feeders.
But once winter arrives trotting will produce good dace and chub to maggot &/or caster.