The £1k limit is about firms not having to have individual credit licences. If a company has it's own credit licence then they do not necessarily need to apply the £1k limit. I was shown the promotional paper work for this example and there was a £2.5k limit, seeing is believing and all that
So doing the maths;
List bike cost: £2500
Minus 40% of cost of bike in tax saving = -£1,000
Minus NI contribution saving, which for ease in this example I will say are 10% = -£250
Total saving = £1,250
Total cost of bike = £1,250
£1,250, spread over 12 months, just over £100 / month.
If you are not a higher rate tax payer the saving is less, but in this specific example said friend was.