Not valid for journeys starting between 16.00-18.29. Connections to journeys that started before 16.00 are unaffected by this restriction.
I assume that your Merseyside pass will get you to Chester (via Birkenhead) for free? If so, Trainsplit suggests that Advance tickets are available for £14.50 (Disabled Railcard discount already applied) each way from Chester to Cardiff making a total fare of £29.00. I note that Trainsplit doesn't offer any splits. If I start from Southport (i.e. ignore your Merseyside pass) then Advances are £16.50 (so £33.00 for a round trip) and again no splits are offered. Starting from Lime Street gives £16.10 each way (£32.30 round trip) with Advances, splitting at Leominster.Any splits for a Liverpool to Cardiff day return? The fares are so expensive.
Don't mind what day I go just needs to be soon.
I hold a Disabled Person's Railcard and Merseyside Disabled Persons Travel Pass.