Experienced Behaviour Analyst here.....
ABA is the process of breaking skills down into small steps and reinforcing the child's progress. Prompts may be used.
There are many different ways to break down these skills. They can be taught at the table and they can be taught through play. Verbal Behaviour does not mean play based, it often refers to an assessment (often used as a curriculum) that emphasises teaching language skills called the VB-Mapp. The VB-Mapp curriculum can be taught using discrete trials. The Lovaas curriculum can be taught through play.
Some very savy behaviour analysts branded "VB" as something distinct from "Lovaas," and used it to mean "not table based." This was a shrewd move about 10 years ago, because the first discrete trial progammes in the UK developed a dodgy reputation.
You need a good consultant who will teach your child in the way s/he needs to be taught in a variety of settings. Any consultant who only does things one way is likely to be a poorly trained or unimaginative consultant.
There is no research showing that discrete trials or play based learning are more effective than each other.
PECS are great. Some people prefer makaton, but again, there is no evidence at all that one is better than the other. Different children have different needs. Any communication system is better than none.
Good luck. I am not from the Midlands and do not know the area, but I hope you find someone you really like.