The SWR press release quotes
There will be substantial changes to our next timetable starting in May, which will bring over 300 additional train services a week for our customers.
300 additional services each week equates to around about 50 extra a day (assuming as you don’t have the peaks the figures on SO and SuO would be about 25 each); the previous list was not about showing whether this was 49, 50 or 51 a day to prove the figure but trying to show what had changed at Guildford in this timetable as this was where you were asking after not trying to prove the semantics.
I’m not going to list out each change or where a service has part replaced another, you can use the excellent timetable comparison tool for this.
https://live-departures.info/rail/timetable-comparison/
However using the same tool here is a list of pure extra trains not changes / extensions / diversions / splits to existing services such as where Ascot to Aldershot currently hourly in the evening becomes half-hourly, extra peak and evening services etc. If used the tool to pick certain key stations do wouldn’t be surprised if I missed some, I stopped looking when I reached 300! This gives you 52 extra services each weekday, 17 each Saturday and 28 each Sunday = 305 per week.
Monday to Friday - 52 per day
05.12 PMH-WAT
05.53 RDG-WAT
06.28 SOA-WAT
06.40 HAV-WAT
06.55 YPM-SAL
07.00 WAT-PMH
07.02 WNR-WAT
07.33 ACT-RDG
07.53 RDG-WAT
08.10 HOU-WAT
08.40 HOU-WAT
10.45 YPM-SAL
12.38 YPM-YVJ
13.20 YVJ-YPM
14.32 YPM-YVJ
14.53 YVJ-SAL
17.05 WAT-RDG (existing 17.05 WAT-FNH re-timed to 16.54)
17.18 WAT-HSL
18.01 SAL-BRI
18.24 WAT-WNR
18.24 RDG-ACT
18.38 HSL-WAT
18.48 WAT-POO
19.23 RDG-ACT
19.35 BRI-WAT
19.47 SAL-WAT
19.48 WAT-POO
19.58 SAL-CLC
20.28 GLD-WAT (via EPS)
20.40 HSL-WAT
20.50 WAT-SAL
21.00 AHT-ACT
21.15 PMH-WAT
21.16 BCU-POO
21.30 YPM-YVJ
21.40 HSL-GLD
21.47 SAL-RDG
21.50 WAT-SAL
22.00 AHT-ACT
22.09 WAT-BSK
21.53 ACT-AHT
22.17 WAT-CSS
22.50 WAT-SAL
22.53 ACT-AHT
23.00 WAT-PMH
23.00 AHT-ACT
23.08 CSS-WIM
23.15 GLD-WOK
23.16 BCU-POO
23.30 WAT-PMH
23.34 FNH-GLD
23.53 ACT-AHT
Saturday 17
06.30 AHT-ACT
07.23 ACT-AHT
11.30 FRO-SAL
12.10 WEY-YVJ
14.16 YVJ-WEY
17.52 SAL-BRI
19.47 SAL-WAT
19.35 BRI-BSK
20.40 HSL-WAT
20.50 WAT-SAL
21.00 AHT-ACT
21.50 WAT-SAL
21.53 ACT-AHT
22.00 AHT-ACT
22.53 ACT-AHT
23.00 AHT-ACT
23.53 ACT-AHT
Sunday 28
07.52 SAL-RDG
08.52 SAL-RDG
09.12 RDG-SAL
09.51 YVJ-SAL
09.52 SAL-RDG
10.12 RDG-SAL
10.52 SAL-RDG
10.55 SAL-BRI
11.12 RDG-SAL
11.52 SAL-RDG
12.12 RDG-SAL
12.52 SAL-RDG
13.04 BRI-SAL
13.12 RDG-SAL
13.52 SAL-RDG
14.12 RDG-SAL
14.52 SAL-RDG
15.12 RDG-SAL
15.52 SAL-RDG
16.12 RDG-SAL
16.26 PMS-WAT
17.12 RDG-SAL
17.26 PMS-WAT
18.18 POO-WAT
18.26 PMS-WAT
18.55 WAT-PMS
19.55 WAT-PMS
20.55 WAT-PMS