Right, we have a problem.
Announced today is a strike on Avanti West Coast on April 5, and an overtime ban on April 4 and 6.
No trains will run on the 5th, and there will be short notice cancellations on the 4 and 6. On 1 April (Easter Monday) there is substantial disruption due to Engineering work, so I sure hope your tour is booked for 2 or 3 April.
If you travel on 3 April (at what is fairly short notice) on the 0853 ex Euston, arrive Man Pic 1105, and pretty much any afternoon train back, using Advance Singles in each direction you will get this for £80 each (c$96)- valid on specific timed trains only.
That is the best you will get at this notice if it is just there and back for the day, no time for scenic routes or clever cost saving routes.
If your tour was in the afternoon the first National Express bus leaves London Victoria at 0700 daily, arrives Manchester 1220, and lots of buses back, From £10 per person each direction.