Hi Mike
I live in the rural West Midlands and I found the 100 miles free then paying £3 a mile cheaper than a taxi which is my only realistic option. I could take the train but I'd need a taxi to and from the local station and then have 3 changes before getting to Heathrow - with Gatwick being worse - and potentially having to stay the night in a hotel at the airport depending on flight times as the first train from here doesn't get to London until 9.15 and then there's London to cross at a busy time, trains alone would cost around £200 even with my railcard. So, all in all, I was better off with the JY offer, even allowing for the balance to pay. I do reaslie it woudl be different for everyone though.
I've been with the two companies that you don't mention 😉 but the number of solo holidays they offer is limited, often only one or two dates per trip, per year. It's having gone with them that's made me realise how much easier and less stressful it is not having to sort my own transport, but I do prefer JY's choice of holidays.
It seems JY are not reintroducing it though, despite saying they may when it stopped. I think that's a great shame as it was definitely an attraction for some. It won;t stop me taking holidays but it will make me look more closely at others.
Happy travels
Riose