Thousands of commuters endured delays and cancellations on the tubes and trains this morning, as a sprinkling of snow brought chaos to London's transport network.
But there is a silver lining - many passengers will be eligible for compensation.
Just make sure you keep hold of your ticket or receipt as proof of your journey, and act quickly - there is often a 28 day limit for making your claim.
SOUTH WEST TRAINS
South West Trains has promised to compensate all of its customers for today's problems - provided they were delayed by one hour or more.
Customer Service Director Jake Kelly said:
"We would like to apologise to our customers for the disruption being experienced across our network today. In common with other transport operators, our services have been badly affected by freezing weather conditions this morning. We believe it's only right that we offer affected customers full compensation for the delays they have experienced today."
The refund will be paid automatically to monthly and annual season tickets holders on renewal of their ticket, but other passengers should apply in writing, enclosing their tickets or proof of purchase, to:
Customer Service Centre
South West Trains
Visit the South West Trains website for further details.
Southeastern operates a compensation scheme called "Delay Repay" for any passengers who are delayed by more than 30 minutes. The refund is paid through Rail Travel Vouchers, rather than in cash.
But beware - if the train company has put a "contingency timetable" in place, compensation claims can only be made for delays to that revised timetable.
Download a claim form from the Southeastern website.
Greater Anglia offers refunds of 50% for delays of 30-59 minutes, or 100% for delays longer than an hour. Claim forms can be picked up at staffed stations or from the Greater Anglia website.
Southern also bases its refunds on the length of the delay.
If you are held up by 30-59 minutes, you can claim 50% of a single ticket or 25% of a return ticket price. Delays of an hour or more will be compensated with a 100% refund for a single ticket or a 50% refund for a return ticket. And if you're delayed by two hours, then you can get a full refund of your return ticket as well.
Click here for full details and to download a claim form.
FIRST CAPITAL CONNECT
Passengers who have been delayed by more than half an hour on First Capital Connect can also claim a refund through their website.
TUBE AND OVERGROUND
Transport for London does not offer refunds for delays caused by bad weather on the Overground or Underground, as such delays are "beyond their control".