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French Drain or Aco Drain discharged into nearest surface water outlet (usually downpipe)

Even with weed membrane you will get weeds grow in the detritus that accumulates between the slate. A weak solution of weed killer will do the trick. Just be sure to ensure it isn't windy to avoid overspray.

Most driveways have to be permeable and comply with Sustainable Urban Drainage System requirements (SuDS) these days and will require planning. Different councils/authorities have different rules on what spec is required but highly recommend you check. I have known driveways having to be ripped...

Hambletons are good. I always use Mainland Aggregates - Type 1 Sub Base However, judging by your previous posts I think it isn't going to be cost effective to replace. If the material compacts ok, it is probably best to make do with what you have.

By no means was a suggesting that it was acceptable due to being spread. But the time and effort it will take to return to a position where it can be collected may be more costly that it is worth.

The certificates wouldn't be supplied with the delivery but should be available on request. It is a shame you have spread it, as the supplier will argue that this is your acceptance of the material. The supplier will be very reluctant to remove the material if it has been moved from the original...

It's recycled Type 1. Those materials are all acceptable provided the supplier has had the materials tested. If it hasn't been tested it is Type 1 Graded Hardcore and not certified Type 1. If you have been sold the product as Type 1 Primary, it is not. If you have been sold it as Type 1...

It might be an Ecoblend which is a combination of the 2.

It's a bit rough but looks ok. Difficult to tell the size but Type 1 can be up to 63mm down to dust in size and still comply with clause SHW803. You could ask for the grading certificate from the supplier for piece of mind. The soily appearance will be cause by crushed mortar dust which always...

The membrane is not just for weed prevention, it is to stop the sub base (i.e. Type 1) from mixing with the sub-grade (i.e clay) underneath. For the sake of a few pound for a membrane I would use one regardless.

Provided the Type 1 is completely level you will have level slabs when you lay them. If not you may need to bed them on a sand/cement mix. You will need to ensure you have plenty slabs to spread the weight of the shed though or you may end up with the floor bouncing.

Can't see that being an issue at all

If they haven't installed it correctly you are entirely within your rights to withhold funds until the job is done properly. If you pay them, you will never get them back.

Alcohol is too cheap in the supermarkets. If they made it cheap in the pubs and expensive in the supermarkets you would get so many more people venturing out. Enjoying themselves in a controlled environment. Many might even have a meal while out, creating more jobs for chefs, waiting staff etc

Must be a regional thing. Crusher Run is 6F2 down here not Type 1.

Crusher Run and Type 1 are not the same thing. MOT Type 1 is produced to a specification (SHW803) that ensures the product is resistant to frost amongst other things. Crusher Run is not produced to such a standard and thus is an inferior product. Crusher Run will often contain recycled materials...

Either is fine provided the finished surface is 150mm below your damp proof course. The path should not be drained towards the house.

Rainwater needs to be discharged into a surface water system such as a soakaway or rainwater harvesting system. You cannot connect surface water systems to mains sewerage.

I think thats a good choice :)

In theory, yes, that would be ok provided the material is compacted properly. However, if the sub soil is saturated you may find the material won't compact peroperly. If you walk on the sub base once laid and there is any kind of give in it, there will be problems down the line. I have walked...