A bargain yes, but it is painfully slow! Not to mention boring! May the Almighty be on the side of the OP if he's unfortunate enough to book onto the slowest Birmingham to Euston services, those are truely awful to endure!
Yes, I DO speak from experience of trips to/from London with LM all the way. It's not quite so bad if you get one that's fast to Leighton Buzzard or similar, but then that said it's still slow as anything after that. My strongest bit of advice would be to have a truckload of stuff to do as you may find yourself bored out of your mind otherwise!
I would also recommend booking First Class Advances if the fares are reasonable, get yourself a table and a power socket. No complimentaries, and if you're leaving at busy times of the day (the 1724 departure from Worcester - booked 150 if that's of any relevance to the OP - will definitely be busy, as will the likely connection to London, the 1833 to London Euston. I speak from experience...) a stronger chance of a seat may swing it for the extra ching. I sure wish I'd gone for it when I came back from London last time. It was rammed in Standard out of Euston and very busy all the way to Birmingham. This was leaving at 1449 from London, with just a solo 350. So be prepared to fight for a seat, as you don't get a seat reservation as such on LM, just an allocated and mandatory service.
Finally, don't forget Birmingham to London services are a mix of 350/1 and 350/2, so if you go Standard Class you run the risk of getting a /2 with no tables and 3+2 layout. Imagine the fun that is with a large cup of coffee in your hand with plenty of other stuff too...
Hope you enjoy the trip to Worcester
