While I have used them before, when it comes to requesting a refund for two flights cancelled by Singapore Airlines, due to the Covid-19 pandemic, Travel Trolley are nothing but obstructive. Customer service is almost non-existent. I can't connect to the phone number they give and, email requesting a refund remained unacknowledged for 38 days. Unacceptable! I am not alone in feeling very disappointed by Travel Trolley's appealing lack of concern for their customers. There is a Facebook group with, at the last count, some 412 members all very frustrated by by the company's appalling attitude. A Facebook search 'Travel Trolley Covid-19 Refunds' should take you there. It is my opinion, I could of course be wrong, that Travel Trolley are acting unlawfully under European Regulation EC261 which still applies to flights into the UK. Not even worth one star.