Such a shame that they have closed down. They were great especially for import cars. I live between both garages JEM MOTORS and JAPEX in Kings Langley, Hertfordshire (Very close to Watford).
I have used both in the past. Both were great. JEM MOTORS were pricier.
Looks like Ill only be going to JAPEX now for my other cars. I have also found these guys https://www.nipponautouk.com/
Have anyone used them. I will be very interested to know! They have some good reviews.