Do any other operators threaten similar 'rules'? In my personal experience, Greater Anglia, Crosscountry, Avanti West Coast, LNER and London Northwestern do not have 'rules' like this at all and exist rather comfortably (some of them on far busier routes that Great Northern serves). Does Northern have anything similar?
Typing "[Train Operating Company] bikes" into my favourite search engine and clicking the top result yielded the following, which for the vast majority of operators can be summarised as non-folding bikes not being allowed at
peak times in the
peak direction on
commuter services for
London (and Cambridge, and partly Oxford and Birmingham), while long-distance services have a limited number of bike spaces per train:
Great Northern: "To make sure there is space for all our passengers at times when our trains are busiest, we don’t allow non-folding bikes: [...] • on trains south of Stevenage or Hertford North timed to arrive in London between 07:00 and 09:30 Monday to Friday, except on public holidays • on trains timed to leave London between 16:00 and 19:00 Monday to Friday, except on public holidays • on trains that are timed to arrive at Cambridge station between 07:45 and 08:45 Monday to Friday (except on public holidays) from King's Lynn, Watlington, Downham Market, Littleport, Ely, Waterbeach or Cambridge North"
Greater Anglia: "Travelling to/from Stratford, Liverpool Street or Cambridge station? Full-size bikes are not allowed during these busy periods. [...] • Cambridge: Arrivals between 07.45 - 08.45 Monday to Friday (not including bank holidays). • London Liverpool Street: Arrivals between 07.45-09.45 (Monday-Friday), Trains leaving between 16.30-18.30 (Monday-Friday), Except for Intercity services, as long as you have a cycle reservation. • Stratford: Arriving between 07.45-09.45 (Monday-Friday), Trains leaving between 16.30-18.30 (Monday-Friday), Except for Intercity services, as long as you have a cycle reservation."
CrossCountry: "Space for bikes on trains is limited so, to make your journey easier, make a reservation for your bike in advance. [...] On most of our trains we have two reservable bike spaces and one further space for unreserved bikes. [...] Bikes must be carried in the designated area of the train"
Avanti West Coast: "bike reservations are mandatory but free of charge. [...] Each Voyager and Pendolino can carry up to 4 bikes."
LNER: "To make sure everyone can travel safely, you must reserve a space for your bike before you board our trains. [...] The number of bike spaces on each train is limited. [...] 5-coach Azuma: Two spaces in Coach K or D, 9-coach Azuma: Four spaces in Coach K, 10-coach Azuma: Two spaces in Coach K and two spaces in Coach D"
London Northwestern Railway: "Full-size bikes cannot be taken on any train arriving in London Euston between 07:00 and 09:59 or departing from London Euston between 16:00 and 18:59 from Monday to Friday (excluding public holidays)."
Northern Railway: "At present, our cycle spaces operate on a first-come, first-served basis, so there is no need to book in advance. Currently, our trains can only carry a maximum of two bikes per train"
Some more London-centric operators:
c2c: "Cycles are not permitted on weekday services arriving in London Fenchurch Street between 07:14 and 09:30, or leaving London Fenchurch Street between 16:30 and 18:35"
Chiltern: "On Mondays to Fridays you can also use most of our trains. The only exceptions are our busiest peak hour services. [...] bikes are not allowed at any point during the journey on any train: • Arriving London Marylebone, Oxford or Birmingham Moor Street from 0745 to 1000. • Leaving London Marylebone, Oxford or Birmingham Moor Street from 1630 to 1930"
East Midlands Railway: "Our EMR Connect trains from Corby to London do not have dedicated cycle storage spaces. Full-size bikes are not permitted on EMR Connect trains arriving into London St Pancras International before 10:00 or departing between 16:00 and 19:00 on weekdays. "
Gatwick Express: "Peak time services - when non-folding bikes can't be carried - are those trains: • Due to arrive at London Victoria between 07:00 and 10:00 Monday to Friday • Due to leave London Victoria between 16:00 and 19:00 Monday to Friday"
Great Western Railway: "Unreserved bikes cannot be carried on trains: • arriving at London Paddington between 07:30 and 09:30 • departing London Paddington between 16:00 and 19:00."
Heatrow Express (PDF): "As our services are very busy on weekday mornings and evenings we are unable to carry bicycles on trains leaving Heathrow Central between 0630 and 1000 or trains leaving London Paddington between 1630 and 1900"
Southeastern: "We cannot accommodate regular non-folding bikes on our trains anywhere between London and Gillingham, Otford, and Tonbridge during our busiest times. That is trains arriving in London, Monday to Friday between 07:00 and 09:59, and leaving London between 16:00 and 18:59."
Southern: " we can’t let you bring regular bikes along during peak hours. [...] • On trains due to arrive in London, Brighton or Kensington Olympia between 7:00 a.m. and 10:00 a.m. • On trains departing London, Brighton or Kensington Olympia between 4:00 p.m. and 7:00 p.m. • We do make exceptions if your journey is entirely within a less crowded part of our network."
South Western: "You cannot take bikes on or off trains that are due to arrive at London Waterloo between 07:15 and 10:00 or trains which leave London Waterloo between 16:45 and 19:00. Stations between Clapham Junction, Feltham/Strawberry Hill and on the Hounslow loop, you cannot take bikes on or off trains which are due to leave Clapham Junction between 07:45 and 09:00."
Thameslink: "To make sure there is space for all our passengers at times when our trains are busiest, we don’t allow non-folding bikes: [...] • On trains travelling towards London that are timed to arrive at or pass through any central London station between 07:00 and 10:00 Monday to Friday, except on public holidays • On trains travelling away from London that are timed to depart from or pass through any central London station between 16:00 and 19:00 Monday to Friday, except on public holidays"