https://www.autodoc.co.uk/ridex/17359083  car is on 135k miles and due a change. My mate will do the work and asked me to order the parts

You’re asking a generic question. There are multiple engine variants on 1.4TFSI platform. If your mates are doing it, get OE, it’s probably less than you think. Failing that a recognised and respected timing belt manufacturer, such as Gates, Continental, etc. This is a critical component, don’t cut corners due to cost.

Hello, 

Why on earth Autodoc and spurious brands?? 
Whatever you do, do not buy on price for this critical application  - always buy quality parts at best prices. 
I’ve always stuck with Gates, who were one of the OE suppliers to VAG.

I don’t have any connection with this company, but try entering your reg. no. into Parts in Motion ( Exeter ) website and see what their prices are. When you have done that, look on EBay for their listings for the chosen part - often a little cheaper via. this route. 
Unlike Autodoc, they do free delivery. 
Always renew the auxiliary belt at the same time. 
135k miles an cambelt never? renewed? Glad you got away with that one! 
Please let us know what prices you come up with. As has been said, worth checking parts price at Audi for comparison. 
Kind regards,

Gareth.

p.s. Where is Rogers? 

thanks for the quick reply, I think the engine variant is 2014 Audi A3 1.4 TFSI (140) CoD S-Tronic. What is OE and I will search for more respected manufacturers.

thanks Magnet, would you recommend changing the water pump too? Rogers was a typo let me change it right now!!

7 minutes ago, Thundercat said:

thanks for the quick reply, I think the engine variant is 2014 Audi A3 1.4 TFSI (140) CoD S-Tronic. What is OE and I will search for more respected manufacturers.

Hi OE, Gates, Dayco, Continental, if you dont change the water pump you will live to regret that choice, most kits worth the money come with the lot, belt ,idler pulley, tensioner, water pump and new bolts.

Steve.

Just follow Steve’s advice Alan, and you shouldn’t go wrong. As said, I would certainly also renew the auxiliary belt at the same time - again, I use Gates. 
Worth ordering yourself some correct coolant - Comma  brand should be fine. 
Please let us know how you get on, what you buy, where from, and at what prices.

Kind regards,

Gareth.