score:5
You're fine. The activity that you describe falls within the scope of permitted activities.
Manufacturing and supply of goods to the UK
An employee of a foreign manufacturer or supplier may install, dismantle, repair, service or advise on equipment, computer software or hardware where it has a contract of purchase or supply or lease with a UK company or organisation.
Secondly, you applied for a visa and told them what you intend to do, if that was not allowed they would have sent a clear refusal letter. Work is not just about any work.