Mike

All of the equipment you have listed will fall under PUWER and will need periodical inspections. The frequency of inspections will depend on a number of factors e.g. your own RA, manufacturer's specifications, and possibly usage, age of the equipment, etc. Electrical equipment i.e. leads and plugs will need a PAT.

As a rule any person with sufficient knowledge of the machinery and working parts is capable of inspecting the equipment. End-users should inspect the equipment before use.

As has been already said, plus, the "inspector" must have adequate knowledge of what the equipment needs to comply with in the form of the requirements of PUWER, which is currently interpreted by HSE as current state-of-the-art.

i.e. current harmonised machinery standards, then one must analyse any deficiencies and decide on whether they are significant or not, with probably a documented risk assessment.

In the iosh magazine, there was a link to a guide on puwer inspections, which I downloaded from british engineering services today, seems a good summary, doc entitled "the essential guide to fulfilling your puwer work equipment inspection obligations", needed to provide email address for download. www.britishengineeringservices.co.uk, previously our insurers asked us to use plant inspection services. plantinspectionservices.co.uk, also used company for jacks & torque wrenches - can't remember name off hand but it was done as a mobile service.(other organisations are available via Safed

In addition, a chat with insurers will identify if they have a preferred inspection organisation as part of their requirements, (typically plant etc), we used to get inspected either 1 or 2 times per year, depending on equipment pressure, lifting etc.

In addition, distinctions should be made on the independence of inspection from maintenance activity, so that you can be sure the inspector isn't swayed by the issue of maintenance they "don't want to do", If you have access to iso standards, they (british engineering services), referenced iso 17020, which i quick-read and felt was good setting out about what inspectors should be like. - see bsigroup for download/purchase options.

an old copy of the guide to maintaning roadworthiness (1998) edition also segregates vehicles into "driver tasks" manger duties, and safety inspections, for a simple, basic way of distributing/explaining activities to others, manufacturers should be able to provide a similar checklist/replacement manual etc. 

a different post / thread states look at hsg 129 for engineering workshops, and the activities you state are reflected within it's scope, so would give you a reference to that too. 

good luck