Pair of Anglia seats M4 Jn33 services to Heathrow - sorted

I'm looking to get a pair of front seats from a chap on 105Speed forum in South Wales to me near Heathrow. Is anyone likely to be doing a Wales to London trip and up for a relay? He said he can meet at Cardiff West services at Jn 33 on M4 and I'm sort of in between the M4 and M3 where they meet the M25 - so I'm flexible up at this end. I've got buddies in Bristol and Southampton who can pick up from you if it helps. Thought I'd ask on the off-chance before couriering...