CITB-registered employers can apply for funding related to how many direct employees they have:

• Employers with CIS only (no PAYE) can receive up to £2500.
• Employers with 1 to 49 directly employed staff can receive up to £5000.
• Employers with 50 to 74 directly employed staff can receive up to £7500.
• Employers with 75 to 99 directly employed staff can receive up to £10000.

https://www.citb.co.uk/levy-grants-and-funding/grants-and-funding/skills-and-training-fund/skills-and-training-fund-for-small-and-micro-sized-businesses/