We seem to quite often get requests for Brian Grove pictures. I found some on my hard drive when looking for something else. They are quite clearly marked with his copywrite watermark, (in fact it is MUCH stronger that a watermark. I suspect that If I posted them on this forum, it would not be welcomed either by the mods or the owner.... Unless....?
By all accounts Brian Grove was quite zealous about watermarking his work (or more accurately, writing all over it). According to Bill Shipton (who, for the record, was latterly keen to distance himself from any association with Grove) this was much down to his background in law.
Many of these pictures have been shared before and of course some of them were promos anyway. I suggest that it's okay to share a small number of examples (as long as they comply with UMD's general rules about model age and content/topic) but not whole sets which would have been sold to you as such for your private use.
Be aware that until I think 1997, the legal age for adult modelling in the UK was 16, same as the age of consent. That was then raised to 18. So be very careful with older images with younger looking models (from any producer) that were shot in the UK pre-1997, as while completely fine when shot they could now break the UMD's rules on model ages.
In general though I think it's a bad idea to re-post older material, even what were free promos, for a variety of reasons including that our memories tend to embellish things and the actual original images often don't live up to how we remember them (I remember when VHS was regarded as high resolution), and that long-ago models may have completely moved on in their lives and would prefer that their old work just remained in private collections rather than being endlessly recirculated.
There's also the risk that reposting promos of a long-gone producer's work could spark demand for their commercial material, giving "justification" to pirates and black-market scene traders, all of which harms current producers and models. If someone really wants to see a classic scene that's no longer available, I'd suggest the best approach would be to get a current producer to shoot a new version of the same scene with current models, as this both gives work to people and creates a high-resolution version of the scene that can be quite legally sold by the producer - or if they pay for the copyright, the commissioning customer.