Isn't the asterix marked on the ticket next to the station where the ticket was purchased?
No, it's a security thing to stop you changing a station name (eg Aber to Aberdeen).
It's surprising how many options there would be to do that, too!
In Aber you have Abercynon, Aberdare, Aberdeen, Aberdour, Aberdovey, Abererch, Abergavenny, Abergele & Pensarn, Aberystwyth
In Ascot you have Ascott-under-Wychwood
In Ash you have Ash Vale, Ashburys, Ashchurch for Tewkesbury, Ashfield, Ashford (Surrey), Ashford International, Ashford International (Eurostar), Ashley, Ashtead, Ashton-under-Lyne, Ashurst, Ashurst New Forest, Ashwell & Morden
In Ashford International you have Ashford International (Eurostar)
In Ashurst you have Ashurst New Forest
In Barnes you have Barnes Bridge
In Barry you have Barry Docks, Barry Island, Barry Links
In Battle you have Battlesbridge
In Bedford you have Bedford St Johns
In Bentley you have Bentley (South Yorks)
In Berwick you have Berwick-upon-Tweed
In Bexley you have Bexleyheath
In Bloxwich you have Bloxwich North
In Bolton you have Bolton-on-Dearne
In Bootle you have Bootle New Strand, Bootle Oriel Road
In Braintree you have Braintree Freeport
In Bramley you have Bramley (Hants)
In Bromborough you have Bromborough Rake
In Brondesbury you have Brondesbury Park
In Brough you have Broughty Ferry
In Brundall you have Brundall Gardens
In Burnham you have Burnham-on-Crouch
In Cambridge you have Cambridge Heath
In Carshalton you have Carshalton Beeches
In Castleton you have Castleton Moor
In Catford you have Catford Bridge
In Charing you have Charing Cross (Glasgow)
In Chester you have Chester Road, Chester-le-Street, Chesterfield
In Chorley you have Chorleywood
In Clifton you have Clifton Down
In Colchester you have Colchester Town
In Cowden you have Cowdenbeath
In Cressing you have Cressington
In Dalston you have Dalston Kingsland
In Dawlish you have Dawlish Warren
In Dean you have Dean Lane, Deansgate
In Denham you have Denham Golf Club
In Dent you have Denton
In Derby you have Derby Road
In Dorking you have Dorking Deepdene, Dorking West
In Eccles you have Eccles Road, Eccleston Park
In Edenbridge you have Edenbridge Town
In Epsom you have Epsom Downs
In Hale you have Halesworth, Halewood
In Hampton you have Hampton Court, Hampton Wick, Hampton-in-Arden
In Harringay you have Harringay Green Lanes
In Hatfield you have Hatfield & Stainforth, Hatfield Peverel
In Hawarden you have Hawarden Bridge
In Higham you have Highams Park
In Hove you have Hoveton & Wroxham
In Ince you have Ince & Elton
In Johnston you have Johnstone
In Kentish Town you have Kentish Town West
In Kirkby you have Kirkby Stephen, Kirkby in Ashfield, Kirkby-in-Furness
In Lake you have Lakenheath
In Langley you have Langley Green, Langley Mill
In Lee you have Leeds
In Lelant you have Lelant Saltings
In Llandudno you have Llandudno Junction
In London Waterloo you have London Waterloo East
In Lostock you have Lostock Gralam, Lostock Hall
In Loughborough you have Loughborough Junction
In Luton you have Luton Airport Parkway
In Maesteg you have Maesteg (Ewenny Road)
In Mansfield you have Mansfield Woodhouse
In Matlock you have Matlock Bath
In Melton you have Melton Mowbray
In Meols you have Meols Cop
In Mossley you have Mossley Hill
In New Cross you have New Cross Gate
In Newbury you have Newbury Racecourse
In Orrell you have Orrell Park
In Par you have Parbold, Park Street, Parkstone (Dorset), Parson Street, Partick, Parton
In Pembroke you have Pembroke Dock
In Porth you have Porthmadog
In Preston you have Preston Park, Prestonpans
In Purley you have Purley Oaks
In Reading you have Reading West
In Roche you have Rochester
In Runcorn you have Runcorn East
In Rye you have Rye House
In St Albans you have St Albans Abbey
In Stamford you have Stamford Hill
In Stone you have Stone Crossing, Stonebridge Park, Stonegate, Stonehaven, Stonehouse, Stoneleigh
In Streatham you have Streatham Common, Streatham Hill
In Sudbury you have Sudbury & Harrow Road, Sudbury Hill Harrow
In Sway you have Swaythling
In Sydenham you have Sydenham Hill
In Trefforest you have Trefforest Estate
In Ware you have Wareham
In Warwick you have Warwick Parkway
In Welling you have Wellingborough, Wellington (Shropshire)
In Wem you have Wembley Central, Wembley Stadium, Wemyss Bay
In West Ham you have West Hampstead, West Hampstead Thameslink
In West Hampstead you have West Hampstead Thameslink
In Whyteleafe you have Whyteleafe South
In Wick you have Wickford, Wickham Market
In Wimbledon you have Wimbledon Chase
In Winnersh you have Winnersh Triangle
In Woking you have Wokingham
In Wool you have Woolston, Woolwich Arsenal, Woolwich Dockyard