Chester is its own routeing point Telford has 2 rps, Shrewsbury & Wolverhampton - Wolverhampton is ruled out by the fares rule so only routes from Chester - Shrewsbury and then to Telford are valid.
The only map combinations are allowed are BC & BC+CH
which give routes of Chester - Shotton - Wrexham - Shrewsbury - Telford
; Chester - Wrexham - Shrewsbury - Telford
and Chester - Crewe - Shrewsbury to Telford.
The ticket is not therefore valid via Warrington.
Peter