Confinement transitions with the characteristics of H-mode are observed in JET inner wall limited plasmas in experiments performed at a magnetic field of 0.8T and at a current of 0.9 MA, using up to 7MW of auxiliary heating power. These confinement transitions are short lived, with durations of up to 20ms, but the overall stored energy increases by up to 5% and edge density by up to 20%. The termination of the period of good confinement correlates with the observation of a burst of magnetic fluctuations, similar to those associated with Edge Localised Modes (ELMs). These transitions in confinement also correlate with a significant decrease in the density fluctuations measured by the microwave reflectometer and a small decrease in the magnetic fluctuations measured using "Mirnov" probes, accompanied by a reduction of the D(alpha) emission. The comparison of the fluctuations in the transitions to limiter H-mode in JET with the divertor H-modes shows a similar behaviour, in particular, the reduction of the fluctuation levels at high frequencies (f>10 kHz) and an increase in the fluctuation levels at lower frequencies (<10 kHz). The strong electrostatic nature of the plasma edge turbulence is confirmed, where a reduction of up to ~50% in the density fluctuation levels correlates with an increase of up to 50% in the confinement time during the transition to H-mode. However, the importance of instabilities with a dominant magnetic component (such as ELMs) is also highlighted, which cause significant increase in transport, including the loss of the good confinement phase in limiter H-modes.