Northerlies at the back end of the week - I would imagine that would be a possible indication of it getting worse if the eruption continues, however is a lot more dynamic than last year.
Metbrief - Met Office Analysis and Synoptic Weather Forecast Charts via Wetterzentrale
And don't shoot the messenger. Met Office were proved right time and time again regarding their ash forecasts, regardless of what the doubters and those with a commercial interest in continuing flying were saying, but Met Office (and NATS) weren't the ones closing the air space and they weren't the engine or airframe manufacturers advising no ash.