South African instructors in UK?

[NorthSouth]

Does anyone know any South African pilots with valid instructors ratings who are currently in the UK or may be over the next few weeks (e.g. SAA pilots flying the Heathrow services)?

I need the services of an SA instructor urgently to do a revalidation of an SA PPL. We have all the permissions from SA and UK CAA to do this on a G-reg aircraft. My regular guy's SA licence has just lapsed so we need a replacement pronto.

Thanks for any suggestions/contacts.