Over here we have the PSI trade fair. Exactly the fair that dyesubbers and promotion articles printers are looking for. It is massive. Im surprised there isn't one in the UK as the firm that runs it appears to be English.
Right next door to the airport, just like the NEC. Only problem is that it costs a fortune to get in , I think this year it was 77€ for non members. PSI membership costs 700€ per year too.
https://www.psi-messe.com/en/