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Indeed, you will have trouble with larger deliveries. Lorries above 7.5t need a minimum of 2.8m for access and even then it is down to the discretion of the driver/company as to whether they will risk it. If I was driving a £150k truck I wouldn't risk damage to the truck and/or property for the...

This is not showing a full mortar bed...yeehaw!

This will cause damp hands down. They shouldn't be doing anything that touches your property. Backfill that has breached the boundary needs rectifying.

2.4m needs to be designed by a structural engineer. It is likely that it will need to be terraced for strength.

You are going to struggle to find anything else suitable at a cheaper price. I certainly wouldn't build a patio without Type 1 and don't know of any reputable contractor that would put their name to a patio that doesn't have a proper sub-base. I wouldn't want to be cursing 2 years down the line...

Type 1 is cheap. No point cutting corners. You will find broken bricks very uneven and difficult to compact.

Totally depends on the Local Authority. Different rules in different areas.

Block paving still comes under SUDS regulations for permeability provided certain sub base materials are used. Usually a 4-20mm Clean Stone is used for the sub-base followed by 2-6mm for the laying course (instead of Sharp Sand). 1-4mm Jointing Aggregate is then used for brushing in rather than...

That's the term I was looking for!

This should work. Type 1 relies on the fines to stay compact so all you are doing is adding fines back.

Yes totally, thank you. When small particles and large particles are mixed together, small particles migrate downwards and large particles up. It is to do with mass and not weight. Get some sand and stones in an ice cream tub and and shake from side to side. The large stones come to the surface...

It looks like the sub base was not laid deep enough. This is easily rectified by lifting the blocks, digging deeper and adding more sub base. Why not just lift the blocks you already have, sort the sub base out and re-lay? It would be relatively cheap to do. Block paving is used in haulage yards...

If your blocks have sunk this suggests an issue with the sub base which will need rectifying first. Any decent contractor will point this out. Resin based gravels look nice although they are on the pricier end of the scale. You could also go down the gravel grid route which gives a gravelly...

This is incorrect. Any stones that aren't bound by fines will migrate to the surface due to the laws of gravity. Most people level their Type 1 with a rake which separates the fines from the larger stone. You then end up with a very coarse area of larger stones which will always want to come to...

?? 900kg is 0.9 tonnes.

For 2 x 2m area you would need 600kg of Type 1, 300kg Sharp Sand, 4 bags of cement. 0-6mm Grano Dust isn't Type 1. This is Type 1

75mm compacted Type 1 followed by 50mm mortar bed for the slabs. Solid as a rock.

Staged payment is a different thing altogether. It is totally acceptable to stage payments, but ensure you pay nothing before any work is completed. Ensure that at each agreed stage you are satisfied with the work that has been completed so far. No payments should be made in advance of any work...

Why would you want it to last longer? It needs to last the time between putting the line down and cutting the slabs. 5 minutes? I think any chalk is capable of that.

Yes, chalk line all the way or it will never be straight.