yeah, I think the main decision you need to make is whether you will want extra services apart from strap on. If not you are looking for those who would class themselves as BDSM providers rather than sex workers.
If it is one of these types that you are after I would consider Mistress Julia Taylor
External Link/Members Only or Sara Borgia
External Link/Members Only the latter ran parties in Worcester with other spectacular looking mistresses. Not seen either in person but would should the stars align.
Otherwise look for a provider you like and trust and then ask the question. Like any service which requires specific equipment just because the provider says they will provide it doesn't mean they have the kit. Similarly others may be willing but haven't listed it because they don't have the kit but would be happy for you to bring. In my experience its a kink that many women love to indulge.