Update: Can't currently see any 'dust' here in South East England, but ALL of the planes throughout the whole of UK have now been grounded since midday today till 8am Friday morning at the earliest, all flights cancelled due to the dust cloud making it's way over the UK. It was in the highlands (Scotland area) and working south-wards.
Appears same has happened in all Scandinavia too (affecting Norway, Sweden, Finland and Denmark). Not sure where else been affected by this.