Is buying a fund from another provider cheaper?

Reluctantpensioner

The retail version of this fund on the L&G link you supplied is:
L&G Global Technology Index Trust R Acc (R - Retail)
OCF 0.70% Minimum Investment £100

The Fidelity version you mention is:
L&G Global Technology Index Trust I Acc (I - Institutional)
OCF 0.32% Minimum Investment £1M. (This is common with the big suppliers, they will sell tiny quantities of "Institutional" shares either through economies of sale, or more likely cooperative sales agreements with the likes of L&G)
You will have Fidelity's usual management charge of .35% (or less).
1.032*1.035=1.068 - so 0.68% total.
I don't know whether L&G have any additional charge.

It is often worth looking up any fund you are interested on trustnet.com, then use the "all units" tab. The relative costs for all fund classes are all laid out. You will find an F class too.

Although trustnet is helpful, it can also be confusing, for example, Initial Charges may be shown. But these are often not paid if you buy through one of the big companies!