In your opinion is there a noticeable difference and advantage to using tubs

Tubulars used to be faster than clinchers. Nowadays the better quality clinchers have caught up. However, if you're buying aero wheels - especially secondhand - it's generally cheaper to get tubular versions. They're easier to make - the tyre sits ON the rim rather than in it.

I reckon the best clinchers - e.g. Continental Supersonic - used with latex innertubes are as fast as all but the very best tubs. Maybe faster. When I tested Supersonics against Continental's own Podium tubulars (racy tubs but not the fastest), the Supersonics were definitely faster. 

That said, there's not a huge amount in it. If you're using normal spoked wheels, I'd recommend clinchers. If you're using aero wheels, whatever the wheels require.

That would be okay. You could pop into where I work 8 til 5:15 NEACO, Norton Grove Ind Est - YO17 9HQ

To continue the thread, do deep rims make a difference, can any body say they notice a difference with bladed spokes or is the lightest wheel the better option to go for.

You have to go fast enough to make them work - otherwise the lighter wheels will be better.

(20mph min average - 25mph or above better. i.e. TT'in)

Deep rims tend to come with bladed spokes as that is the idea (aero) so no test data to go on. Minimal difference, but all helps.

Lighter wheels are good for hilly routes but some do have a weight limit for the rider i.e. Super light wheels no good for heavier riders.

It really depends on how much wad you've to spend and what you want to do with them.

If you have enough you can get both super light weight and aero deep rims as well. (Zipp 303 - 1182g a pair - 44mm deep - £1300)

Tommo said:

You have to go fast enough to make them work - otherwise the lighter wheels will be better.

Well yes, but if we're talking about time trialling, aerodynamics are much more important than weight. Lighter wheels are only better if you're accelerating, riding uphill and/or riding pretty slowly. Chris Boardman won the National Hill Climb with a disc wheel.

I would have thought that a slower time triallist (e.g. 20mph average) will actually save MORE time using a disc wheel than a fast (28mph) time triallist will. (The faster rider might make better efficiency gains, but he's further up the J curve and fighting an inverse cube law to go any faster.)

In short, Jeff, deep rims do make a difference. Get a deep section front first. And put an 18 or 19mm tyre on it rather than a 23mm.